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When someone gets wasted at the beginning of a party and has to leave or passes out. It can also refer to the phenomenon of making party plans for Saturday night but getting so drunk or staying up so late on Friday that you can't make it.
You: "Dude, you left my party at 9pm. What happened to you?"

Me: "I party pre-ejaculated."
by angelossary April 19, 2010
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