Iruttu Araiyil Murattu Kuthu (lit. 'Fierce punch in a dark room'; coll. Fierce masturbation or sexual encounter (punch; euphemism) in a dark room) is a 2018 Indian Tamil-language adult horror comedy film written and directed by Santhosh P. Jayakumar and produced by K. E. Gnanavel Raja. The film stars Gautham Karthik and VJ Sha Ra, with Yashika Aannand, Chandrika Ravi, and Vaibhavi Shandilya are in the female leads. The music was composed by Balamurali Balu with cinematography by Ballu and editing by Prasanna GK. The film was released on 4 May 2018.

The film was later remade in Telugu as Chikati Gadilo Chithakotudu by Jayakumar himself, while a spiritual sequel Irandam Kuththu was released in November 2020.