A slang for a person, whom seems to have a shady character, that most likely has a mugshot out there somewhere, from a prior arrest.
"I don't trust that guy, he's a mug!"
An extreme amount in any context or fashion
That gurl is crazy as a mug.
It's cold as a mug.
being used (like a mug for drinking) for someone else's benefits.
if a girl is using a guy for his money he might say, 'urghh I feel like such a mug!!'
Brian: Whoa, where the hell did my coffee go?
Ethan: Looks like you're the victim of a mugging.
Brian: Damnit!