Top Definition
A girl's vagina when she is on her period.
"Bleeeerrrgghhh.. Jesus girl put it away, you've got jam flaps"
or
"Yum Yum, bring that over here, I'd love to chow down on your jam flaps"

(depending on your personal perversion)
by DJ N-Fuzion February 11, 2008
5 Words related to jam flaps

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