Situation in which a person becomes so intoxicated while hanging out with friends, that they pass out or black out before going out to bars
Person #1: "Oh man, what the hell happened last night?"

Person #2: "Bro, I knew you were gonna pre-party ejaculate drinking that scotch, bro; you barfed in the cab on the way to the bars.

Person #1: "Did I hook up with anyone?"
by JSBizzle September 21, 2011
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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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