While having sex you finger the girls ass and make sure to get her poo on your finger. When ready, you pull out (before during or after cumming as it does not matter.) and smear her poo from one cheek, across her lips to the other cheek. When she gets mad at you, simply ask "Why So Serious?".
I gave her the joker last night. After I smeared her poo from one cheek to the other via the lips she got all mad at me. So I asked her "Why so serious?"
by Ian's Mustache November 02, 2009

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First off, take a girls virginity. When she starts to bleed, get some blood on your fingers and smear it around your mouth from cheek to cheek. When she starts to cry or look disgusted, yell out "Why so serious?!"
Jenny started to bleed from the vagina, because it was her first time having sex. John then began to smear her blood all around his mouth from cheek to cheek, pretending to be the joker. As Jenny started to cry, John then proceeds to yell out "Why so serious?!"
by Keith Bill January 28, 2009

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The Joker is a sexual maneuver performed by a man having sex with a woman on her period. The man sticks two fingers into her pussy and then inserts his bloodied fingers into her mouth, thus giving her a bloody smile a la The Joker. When she turns around to angrily ask what he's doing, he exclaims, "WHY SO SERIOUS???"
Chris told me that he pulled off The Joker last night. That explains why his girlfriend is so upset!
by dudekakke August 29, 2008

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A sexy stealth face blasting move in where you pull your "dork" out and blow your load in a smiley face motion on the girls/boys face and when they are just about to yell at you, you say "WHY SOOOO SERIOUS!?!?!?"
I gave my bitch the Joker last night...we laughed all night long...she's all smiles now!
by Smokin' Joker September 12, 2008

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a great prank to pull while doing some broad from behind. you take a dildo that is relatively the same size as your weiner, then slip it in whichever hole you are using, and then proceed to silently run away.
i realized i needed to shake this stage 4 clinger, so the last time we were boning i slipped her the joker. haha fooled her!
by devantaya May 18, 2008

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while fucking a girl from behind, you stick both of your forefingers in the corners of her mouth and lift up and away creating the joker
it didnt look like she was enjoying the anal sex as much as i was so i gave her the joker
by balls to tha wall July 30, 2004

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the act in which a male is having sex with a female while on her period and then pulls out to slap his penis across her mouth.
Hey dude, did you ever see the Batman movie? i made my girl look like the joker last night!
by Dirtier Than Dirt December 24, 2007

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