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1.
noun; a state of miserable and agonizing itchiness and discomfort in the genital region

verb; to suffer from awful, awful chafing and pubic itchiness

BRO 1: Dude, I can't go out. I'm in a gronch like no other.

BRO 2: Aw, bummer man.
by keystoned April 15, 2009
 
2.
To crush and/ or mangle something.
"I gronched my burger when I sat on it."
by Shannon Bell November 19, 2005
 
3.
1. To eat someone's food without permission.

History: Gronch is an onomatopoeia for the sound of eating a crunchy food.
Don't be gronchin' my almonds, foo!
by BongTokinAlcoholic June 20, 2005