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Something that really sucks, is mega-lame, and/or blows goats Reno style. The opposite of the jump off, which means a really awesome thing or event.
Peter: "Wasn't Sean's party last weekend the jump off? I hear you hooked up with Veronica after that. Way to go. Soooo hot, want to touch the heinie."
Robbie: "Yeah the party was the jump off, but you know what's the jump on?"
Peter: "What?"
Robbie: "I think I got the clap!!! It itches. Also I've got some real nasty you know who."
Peter: "Ooooh...Dick Trickle? That's rough, chief. Totally NCAA."
Robbie: "Word to your mother."
by Nicholas D January 19, 2008
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