butt boing 

the act of shoving one's cock up another guy's anus; anal sex

the 2 gays took turns butt boingin' each other

butt boing by Ziggy Stardust February 1, 2004

being a butt 

When a task, object or person is being difficult or unpleasant.

Jane: I can’t believe your teacher would not let you turn your paper in late.
Nick: I know she’s being a butt

Or

John: You still haven’t finished assembling that desk
Paul: No man its being a butt

being a butt by nickoliravioli February 12, 2009

Being a butt 

When a task, object or person is being difficult or uncooperative.

Sometimes being a bum can be a good thing! If used in a joking manner

harley says on many occasions that her boyfriend is being a butt

Being a butt by Brodizzzle September 15, 2013