Top Definition
A police informant; a "rat".
Hey, I thought I got away with that burglary but my crime-partner pulled a McGruff on me.
door Bobby Rose 10 november 2007

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A guy that Hangs out at Old #3 in Roslyn, WA trying to get young guys to go to the bathroom with him.
You want to go McGruff in the bathroom
door Baller42o 26 mei 2009

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1. Crime dog
2. Used to describe a smell like that of a dog.
3. Libby
"I need to take a shower, I'm getting a bit Mcgruff."
door The Admiral 23 juli 2003

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