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1.
Short name for concussion jumping, or, using concussion grenades to perform trickjumps in the half-life mod, Team Fortress Classic. Started out with easy crap such as concmap_r, and now there are maps that are so fucking huge, you would go insane trying them.
"Who's up for some concing on concmap_cze_r?"
by Sam August 06, 2004
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