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8.
usually on a hot or humid day, when one side of a guy's nuts stick to his leg.
“Its so damn humid today, I've got a fuckin post-it that just won't go away.
by andytheman February 09, 2007
 
9.
While having intercourse, you withdraw and ejaculate on your palm then slap your partner in the face with your ejaculate smeared hand.
Wow, you just gave me a post-it. We're breaking up.
by Douglas DeLongpre March 11, 2005