What is Slack Flaps?
1.
term used to describe a woman who has loose morals in the sex department, has put out so much that theres no tread left on the tyres.
i was doin this chick last night, she had slack flaps.
her flaps were so slack it was like feeding a kitkat to a whale.
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The act of inserting one's testicles into another's anal cavity ball by ball for the enjoyment of all parties (including any w..