A police informant; a "rat".
Hey, I thought I got away with that burglary but my crime-partner pulled a McGruff on me.
av Bobby Rose 10. november 2007
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
av Baller42o 26. mai 2009