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1.
(Verb) The female version of teabag.
Oh man, that girl owned you so hard that she's clamflapping you!
by PricklyPorcupine July 08, 2010
 
2.
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