"Ain't It Fun" is a song written by Peter Laughner and Gene O'Connor (known as Cheetah Chrome) and performed by their protopunk band Rocket from the Tombs.
The song was first released by O'Connor's later group Dead Boys on their 1978 second studio album, We Have Come for Your Children.
The word's presence was not picked up on by the media at the time, with the same being the case in the release of Guns N' Roses' 1993 cover, which reached the top 10 in several countries' singles charts despite being uncensored.
GNR guitarist Slash observed that Monroe "was just excited about having it come out, because it was a cool song, and it was sort of a memorial for Stiv Bators".
Rollins Band also covered the song for their album A Nicer Shade of Red.