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Flap flossing occurs when a girls bathing suit is too small, or her vagina is too big for the garment, resulting in a noticeable flap flossing
Kristin-"Should I wear my one piece thong lifeguard bathing suit to the lake today?"
Katie-"Why the hell wouldn't you?"
Kristin-"Either my vagina got bigger or I shrunk my suit because I am flap flossing hard right now"
by Ebesneezer bahonkers October 02, 2015
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