when someone has had way too much anal sex and their anal cavity falls out like an elephant trunk
Look at that...that girl has some serious trunk ass.
by David Meacham January 20, 2003
something really really dirty and smelly, but in a totally boss kind of way.
oh man, this blanket is trunk-ass, but it keeps me warm!
by chessie August 28, 2004
An individual who enjoys object of an equivalent size and nature to an elephant trunk stuck up their anus.
See that bottom over there? He’s a real trunk-ass, and it's given him a loose asshole. If you go home with him tonight you'd better be packing or ready to double dutch rudder.
by Michael Parga November 13, 2013