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1.
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
by nickoliravioli February 12, 2009
 
2.
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
by Brodizzzle September 15, 2013