Top Definition
When a hard or semi-hard erection is suddenly made limp by seeing something or someone.
Jimmy was at the drugstore buying condoms and the very thought of the night he had ahead of him had given him an erection. However, at the checkout, Jimmy suddenly experienced a pinch flat when the obese, middle-aged woman at the counter gave him a wink.
by swimswimswim May 10, 2009
8 Words related to pinch flat

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