Top definition
When a dude has a one night stand with a chick, pulls out and then jizzes all over her. Works best when the girl is abnormally proper and hates the idea of jizz.
Guy 1: "Dude! Did you hear that Alison got flanaganed last night?"

Guy 2: "Haha! She probably freaked out!"
by The Flanaganator May 25, 2010
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