(noun) An insult that is usually used as a synonym for: retard, pussy, cunt, dipshit, really anything that you want. It's origin come from sperm dumpster, which is used to call a girl a slut. But jizz wagon can be used as anything. The wagon meaning you are full of jizz. Not having any relation to the idea of slutiness.
Guy A: Dude you suck at that
Guy B: Stfu u jizz wagon

Guy A: Wait so is today Monday?
Guy B: No its friday u fuckin jizz wagon

Guy A: I dont wanna fight you
Guy B: Why not, you jizz wagon.
by Yonce's lover April 2, 2014
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