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One, who while playing Halo 3 via Xbox Live, is so terrible in combat that they rely on throwing grenades randomly at their opponent, much like a chimp throwing feces. Also have a tendency to jump around randomly in the air, much like a mad primate.

Are often taken out with a good ol' smack to the head.
Oh man, that Slayer match on Sandtrap last night was so easy. There was this one Master Chimp I killed like 15 times!
by Seth Einus October 26, 2007
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