The thing you say at Six Flags when the ride is going to start.
Annoucer: Okay everybody have a good time Boo-a-woop
Everybody else:Boo-awoop
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A fictional, slide-whistle type noise imagined to be made during anal insertion. "Boo woop" can be used when describing anal sex, to get someone's attention, or just for fun in everyday conversation.
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