Three friends – Meet (Vivek Oberoi), Prem (Aftab Shivdasani) and Amar (Ritesh Deshmukh) – are all unhappily married and have unsatisfactory sex lives. Meet thinks that his wife Unatti (Karishma Tanna) is having an affair with her boss; Prem thinks that his wife Tulsi (Manjari Fadnis) doesn't spend quality time with him and Amar feels that his wife Mamta (Sonalee Kulkarni) is more concerned about their son, Pappu.

One day, the men receive an invite from their college, SLUTS (Sri Lalchand University of Technology and Science), to attend their college reunion. Their wives don't come with them, so the three decide to use the trip to get up to mischief in order to escape their unhappy marriages.

When they arrive, they find that everyone else is behaving in an overly conservative manner. This due to the fear of Principal Roberts (Pradeep Rawat), who hangs people naked on a tree if they disagree with his rules. They find out that a former student, Hardik (Suresh Menon), is in a mental asylum because of the principal's deeds. Meanwhile, Prem meets one of his former teachers, Rose (Maryam Zakaria), and is attracted to her. Meet meets Marlow (Kainaat Arora) and is attracted to her. Amar meets Mary (Bruna Abdullah) and is attracted to her. The men begin to initiate affairs with the women, but soon find out that Rose, Mary and Marlow are relatives of the principal. The men's wives later arrive at the college, intending on joining them at the reunion.

The trio receive an MMS message containing footage of each of them having sex, and succeed in hiding the video from their wives. They find out that it was Hardik who sent the video, and he blackmails them. Their task is to kill the principal in order to fulfill Hardik's revenge, or else he will show the footage to their wives. They fail in killing him, so they decide to try to delete the videos off Hardik's phone. They succeed and continue to spend time at the reunion.

On the last day, the principal mixed a love potion into the soup, which caused people to deal out those they are attracted too. The trio end up being with Rose, Mary and Marlow, and the principal catches them red handed. While being chased by the principal, the girls reveal to the men that he is impotent. When the trio end up on the roof of a building, Hardik pushes the principal and the principal slides down the roof and hangs on to a bar. The men try to save him but Hardik pushes them, too, and they hang onto the principal. The girls come and push Hardik off the roof and he hangs on to Meet. The three tell principal the truth about not making love with Marlow, Mary and Rose. The girls try to make a rope out of their clothes, but the boys fall and end up in the hospital.

Their wives angrily ask them what exactly happened that night. Principal Roberts calmly replies that due to a misunderstood affair, their husbands suffered this consequence. Shortly later, a doctor comes and informs the principal that he is no more impotent since the blood now properly flows all over his body due to the pressure generated while hanging on the bar. Hardik marries Marlow. The film ends with the trio about to have sex with their respective wives, as they rekindle the romance.

• Riteish Deshmukh as Amar Saxena
• Vivek Oberoi as Meet Mehta
• Aftab Shivdasani as Prem Chawla
• Sonalee Kulkarni as Mamta Saxena (Amar's Wife)
• Manjari Fadnis as Tulsi Chawla (Prem's Wife)
• Karishma Tanna as Unatti Mehta (Meet's Wife)
• Maryam Zakaria as Rose (Prem's Interested, Robert's Wife)
• Bruna Abdullah As Mary (Amar's Interested, Robert's Daughter)
• Kainaat Arora as Marlo (Meet's Interested, Robert's Sister)
• Suresh Menon as Hardik
• Pradeep Rawat as Robert Pereira

The production of the film was to begin in the first week of August 2012, but due to actor Riteish Deshmukh's father Vilasrao Deshmukh's critical health condition, the film's commencement was put off by a few days. Says a source close to the project, "Grand Masti, the sequel to Masti has been in the writing process for the last one and a half years. Finally, writers Milap Zaveri and Tushar Hiranandani cracked an idea and scripted the sequel. The film brings back the Riteish Deshmukh-Aftab Shivdasani-Vivek Oberoi trio, along with four new girls. Grand Masti was supposed to kick start this week. Then, Ritesh's father fell ill. He can't be expected to act funny at a time like this."

A suggestion that the film take off without Riteish was also put forward. However, producer Ashok Thakeria and director Indra Kumar refused, arguing that a comedy is a happy occasion and therefore all the actors needed to be comfortable. Reportedly, the film then started filming on 9 September 2012. The film's original release date was put between 31 July-late August 2013.

According to the print version of Hindustan Times (dated 18 July 2013), Grand Masti (Masti 2) was set to release on 13 September 2013. The first official theatrical trailer was uploaded on the official YouTube channel on 18 July 2013. The stadium scene was shot in DY Patil Stadium apparently.

Parts of Grand Masti was shot at the Laxmi Vilas Palace, Vadodara, in Gujarat.

The film's music was composed by Anand Raj Anand and Sanjeev Darshan, and the lyricists are Kumaar and Manoj Darpan. It contains 3 songs, one remix song of the title track and one mash up.

Grand Masti was made at a budget of ?310 million, including the production cost of 190 million and the remaining 120 million for Print & marketing. Grand Masti was submitted to the censor board three months ahead of its release date in June 2013. The film was not released in the UAE. Grand Masti was released huge on 13 September 2013 across approximately 2100 screens in India.

Controversies

The Punjab and Haryana High Court had stayed the release of Grand Masti in Punjab, Haryana and Chandigarh on 10 September 2013, but later lifted the stay order on the film and the film was released on 13 September 2013. A division bench of the HC has vacated the stay after hearing an appeal filed by the movie's producer Ashok Thakeria against the orders of the single bench. After a complaint about vulgar and obscene dialogue in the film, the Central Board of Film Certification on 16 September 2013 said it had constituted an inquiry against the movie. A 22-year-old youth Vasai resident, Mangesh Bhogal died due to a heart attack caused by excessive laughing.

The film was promoted on TV shows like Comedy Nights with Kapil. The star cast also visited theatres upon the release of the film. A book on the film written by Neha Puntambekar, basically chronicling the various escapades of Amar, Meet and Prem, the three principal characters of Masti franchise was also released. Mumbai Indians cricketers Sachin Tendulkar, Harbhajan Singh and Pragyan Ojha attended a screening of the film in Ahmedabad during preparation for 2013 Champions League Twenty20.^[35][36][37]

The film received mostly negative responses from critics due to its adult content but a polarised welcome from the general public, while youngsters constituted most of the film's viewership, it was criticised from the family audience's point of view.

Taran Adarsh of Bollywood Hungama gave the film 3.5/5 and stated that Grand Masti "crosses all limits and boundaries vis-a-vis adult humor. This one's strictly for those who relish naughty jokes, outrageous lines and scandalous visuals."^[38] Anupama Chopra of the Hindustan Times gave the film a 0.5/5 stars.^[39][40] Mohar Basu of Koimoi gave it 0.5/5 and called it a "grand tapestry of trash".^[41] Rohit Khilnani of India Today awarded the film with 1.5/5 stars.^[42] Abhishek Mande of Rediff introduced 0/5 and remarked, "there is no way you can enjoy this movie and still claim you respect women".^[43]