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The act of refusing to put on a condom: unprotected sexual intercourse.

Usually ends badly.
Chris: "We were in the bathroom, her ass going wild when I revealed I was YOLOing it."

Mike: "What'd she say?"

Chris: "I think she was too drunk to hear what I said"

Mike: "I heard she got pregnant"

Chris: "Fuk."
by TheLonelyAtoll February 22, 2014
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