Top definition
A depression in the cushion of a couch or chair formed by many hours of sitting. First known usage by Homer Simpson.
Don't sit in my ass groove! You'll mess it up.
by kelly September 12, 2003
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Soft and offensive. Just like you.

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2
Ass grooves were left from sitting on the coach all day.
by dwayne May 12, 2004
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The vengeful act of crapping on a lover's chest while they sleep.

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