1 definition by Bartleby The Scrivener

When an individual from a different crew, hood, or area looks at you like they're going to do something...like they want to throw hands.

A mean mug is essentially and upside down smile. When an individual proceeds to throw you a mean mug, immediately, you should shout "FIX YOUR FACE!"
Yo fish! Not only is that ungreatful he-bitch Hoo-Ridin, he mean muggin! That fool best be fixin his face!
by Bartleby The Scrivener November 15, 2007
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