Top Definition
to violently sneak.

To go or move in a quiet, stealthy way while having some sort of a violent, destructive motive.
That fucking oven door gretched up on my hand!

Hey man, stop gretching up on me!

So, I was playing paintball and had a sweet sniping spot. Then out of no where Chris gretched up on me.
by LxBxC June 15, 2007
Gretch - A mouldy, unclean and/or rotten vagina.
"Damn, man, that girl last night had the worst gretch I'd ever seen!"
by Nacho Man Sandy Ravage September 08, 2014

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