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1. butt flap
A square piece of cloth (usually advertising a punk band) that is safety pinned to the back of a dirty, smelly, gutter punk kids pants. Similar to a trucks mud flaps and a loin cloth.
Why do the gutter punk kids wear those butt flaps? They are so ugly!
2. butt flap
when obesity causes rolls to protrude from the buttocks, causing a sort of 'flap' that at time may sway to and fro.
omgz my butt flap, someone help, need butt flap assistance
3. butt flap
A loincloth. A term used first in George of the Jungle, but most notably in George of the Jungle 2.
"He keeps the deed in his what?"
"His, um, butt flap..."
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