Top Definition
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!

by Jody Harris June 18, 2006
7 Words related to Butrobics

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