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To add members to, or become a member of, someone else's "mafia."

Originally just shorthand for joining/asking someone to join you in Mafia Wars, it now includes real life situations.
(1) Bob: Mob up! bob90210@hootmail.org

(2) Carl: Yo, those four guys have been messin' with us all night.

Dave: Well there's only the two of us, so if you wanna take 'em on, we're gonna have to mob up.
mob up by JamesBeam March 12, 2010
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mob upto vandalize or destroy a piece of proprty very bad with grafiti.
ay homie watch my back while i mob up this billboard.
mob up by OGMONKS April 2, 2007
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