Top Definition
A poon moon occurs when a woman purposefully flashes her vagina at someone. This is usually a joke, not an invitation for sex.
That little bitch thought she had me when she showed her ass, but I retaliated with a poon moon, and we both know who won that war!

The guys at work are always flashing their balls, and since I don't have them I joined in with a poon moon!
by Moltov Cocktease August 11, 2010

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