A physical gesture consisting of a person creating a vagina with his or her hands by connecting the index fingers and thumbs in an extension while the other fingers are clenched as in as fist. Then thrusting this hand formation forward quickly so as to place a stamp. This stamp is bestowed upon those who willfully exhibit weak and otherwise un-manly or "pussy" actions
That guy just got dragged out of the bar by his wife. Lets clam stamp his forehead!
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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.