Top Definition
The act of vomiting on someone unexpectedly.
Joe: Yes that's right I just vomited on you unexpectedly.
Beau: Damn dude, I'm gonna kill you!
Joe: No it's cool, that's a St. Louis Surprise.
Beau: Oh, right...
by Don Turgenson April 11, 2008
5 Words related to St. Louis Surprise

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