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The wet, brown, sticky substance puddled on the floor after a mosh-pit has cleared.

Normally consisted of dirt, spit, sweat, booze, and very possibly blood.
Friend#1: Oh, dude gross. I have mosh juice all over my shoes from that concert last night.
Friend#2: Yeah, I got knocked over in the pit and some got on my arm. I dare you to smell it.
by holycrapboredom October 12, 2009
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