1 definition by purplecalculus

Top Definition
When the muscles of the buttocks tighten up suddenly and unnecessarily, causing the feeling that the butt is under attack.
Often times this happens when you have to poop really bad.
John: Ah, butt attack!
Moses: You have to poop, man?
by purplecalculus June 26, 2011

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug