The act of slapping another with your vagina. Usually done in retaliation to a mushroom slap of some sorts. Usually a sticky mess.
"Stina really showed her boyfriend who's boss last night, she clam stamped Danny all over the face! See if he ever fadunks her again!"
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It's the girl version of T-bag. A girl is up above the face of someone else & she would dip down and rub her vagina across their forehead then leave a snail trail.
"If you don't shut your mouth, I'll shut it with my vagina" ... clam stamp.
Clam Stamping is when you don’t see in the middle of the night and sit on your toilet only to find out the cover was on it, leaving a lil bit of clam juice on your seat cover
Jennifer: hey girl, your seat cover has some crustier on it, looks suspiciously vaginal shaped?
Bonnie: oh yeah, last night I went to take a piss and accidentally sat on the seat COVER and not to seat
Jennifer: oh shit! You gave the seat cover a good clam stamping!