Extreme male orgasmic reaction to extraordinary stimulus. Not to be confused with cumdumpster.
I think I just took a jizzdump!
by BRWEIR February 17, 2011
when someone deposits a copious amount of semen over a railing onto the passerby below.
A: Dude you totally just jizz dumped. They are going to be pissed!
B: I know, let's get the fuck out of here.
by eljefethesnake March 10, 2012

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