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.
by JamesBeam March 11, 2010
mob upto vandalize or destroy a piece of proprty very bad with grafiti.
ay homie watch my back while i mob up this billboard.
by OGMONKS March 27, 2007

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