1 definition by Jody Harris

Excercise for your bottom. Often done by walking long distances and going all day while clenching your Bumb cheeks.

The effect is, (after extensive butrobic programmes and devotion) a rock hard ass.
Jack: Fresh from 2 hours of BUTROBICS, i give you, MY ASS!

(Moonie)
by Jody Harris June 18, 2006
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