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because its the flappiest part of the vagina it is the optimal spot for a raspberry: when one presses their lips against the labia majora and blows air making a sloppy wet sound.
Me: hey Chris, I clam flapped your wife last night...
Chris: "oh yeah, I was gonna clam flap her last night too but she was on her rag. BURN!"
by Naterball, Aimdog, & Briggs October 14, 2011
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