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1.
Definition #1 (standard usage): When you say you're going to go somewhere to hang out and party, but then cancel the plans at the last minute.

Definition #2 (sexual usage): When you say you're going to come, but then you don't.
Paul had been telling his friends for months that he'd come to the big new year's day party...but then he pulled a woo.

So I was banging this chick in a church one day, but right while we were in the middle of it I looked up and saw Jesus up on the crucifix glaring down at me, so I decided to pull a woo.
by Destri48 March 08, 2011
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