Top Definition
1. When the sweat from a mans sack runs down his leg and eats away the elastic in his socks.

2. Another term for chaifing or swamp ass.
Guy 1; Why are you walking like a cowboy?

Guy 2; It's the humidity man, I got the grut!
by Biohavok May 01, 2009
5 Words related to The Grut

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