To gently place your vagina on you sleeping partner's forehead in an effort to leave a short-term, sloppy impression. When your unsuspecting guest identifies the smell and warm sensation on their forehead you say, "You've been stamped!"
Like a snail, Lynn mounted John's head and left a wet, sloppy clam stamp.
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!