Top Definition
1. when a player in CounterStrike is killed by the suckiest submachinegun, his killer says: UMP j00!
2. At the start of a game of CS a player who buys the UMP submachinegun calls out: UMP J00! to put fear in the hearts of his opponents!
Me: UMP j00 N00BS!
N00b1: OMG I R UMPED!
N00b2: OMG ME TO
by Anonymous September 01, 2003

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