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It is when a women engages in the act of jumping directly on top of a man's erect penis with no warning. This is a very dangerous maneuver, so take heed.
Tom: Fuck dude, my dick hurts from last night.
Captain America: Why Tom?
Tom: My bitch gave me a jumpjob last night.
Captain America: I would ice that shit if I were you nigga.
by suckmynutss September 14, 2009
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