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Noun - A screw-up who messes up when easiest to avoid.

Verb - To screw-up in a situation which can completely be avoided.
I'm such a goddamn chopper mar!!! Who kills his own worm with a bazooka. Right near a fire drum no doubt.

Grahul, you really chopper mar'd when you blew up your own worm with the Holy Hand Grenade.
by WormsReloaded January 17, 2012
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