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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
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2
1. (n) A person who neglects to speak constructively.
2. (v) To speak with destructive intent.
Asking "why" exhibits Gretch-like behavior.
by Burma's cat, Yac{k}s January 22, 2018
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