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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 February 4, 2009
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The act of having sex with a girl who is a virgin or on her period and after you pull out smack her across the face twice to make what looks like the joker scars from Batman with her blood from her vagina.
Bill: I pulled off The Joker last night, I had to surprise her with it though I knew she wouldnt go for it.

Jim: No shit dude! thats pretty nasty you cant blame her
by UncleGameTight September 3, 2009
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The Joker is when you fuck a girl who is on her period. You then take your bloody dick, cockslap her in the mouth and ask her "Why so serious?".
I gave my girlfriend The Joker last night during sex.
by Roam/Bumble Gums April 2, 2011
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when you go down on your girl and she has failed to mention that her monthly gift has arrived and when you come up from doing your business, you look like the joker from batman
haha jack totally got the joker from his girl last night
by sup it be chels February 20, 2009
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when a man has sex with a woman on her period. He pulls his dick out and smacks it across her mouth and says "Why so Serious?"
jack went up to his buddy john and said "man, me and jill were doin it earlier and she didn'tell me she was on her period." john looked up at him and asked "so what'd you do when you found out?" "well," jack said, "i looked at here dead in the eyes and pulled the joker on her."
by radar180 September 24, 2009
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When a person eats out a girl on her period then comes up for air, the girl reaches down and smears the blood into a Joker smile.
Girl, it was that time of the month but he still wanted to go down on me. So I reached down and gave him a Joker.

The Joker- best thing to do to a man if he eats you out on that time of the month.
by Dirty-J95 July 12, 2019
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The act of ejaculating in someone’s mouth then proceeding to put both thumbs in their mouth and making a large smile on their face with your semen.
Last night while watching Batman I turned my girlfriend into the Joker.
by Jym laidherr November 17, 2020
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