Top Definition
1) Refers to the potential excitement that can arise from a man once he realizes that he's going to get laid. Once the 'pin is pulled' by a significant other, sexual intercourse involving the man is imminent.
Things were getting hot and heavy in the car. But once she unzipped my pants, she pulled the pin on my groin grenade.
by KakashiBallZ June 16, 2008
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