Top definition
To give someone dirty looks or to stare them down. Also known as "mad doggin".

Damn homie, that fool was grimmin. Let's punk his ass.
by Baby Blaze420 July 19, 2006
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2
(grimm-in)verb: To threatin to kill; to grim
ima b grimmin u if u don't shaddup!
by Elz3r September 26, 2005
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