Sexual act usually performed by two or more males where each participant attempts to insert the largest object into their anus. Size is typically judged by length though usages of average width and width at widest point have also been recorded.
Man that five hour long butt off was intense, I'm still shitting out styrofoam.
by timmy1234567 June 07, 2011
1 more definition
go away,pick up your ass and get lost
Stop bugging me man ...just butt off!
by krupali April 04, 2005