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1.
An expression to be used solely at times of utmost revulsion.

When a concept or notion is so horrifically revolting that the traditional courses of nature are reversed; thus forcing any ejaculatory fluid that would otherwise travel out of the penis, back up the unfortunate organ, causing extreme pain and discomfort for the sufferer.
Douchebag 1: Dude, that chick's so ugly I just reverse jizzed.

Douchebag 2: Ya, I totally feel your pain man. Just last week I walked in on my Dad engaging in sexual congress with a piece of patio furniture D: ...it totally made me reverse jizz. ಠ_ಠ
by BrewBrewXx April 18, 2010