A very attractive psycopath appearing in the movie "The Dark Knight". Also a less hot psycho appearing in many other movies.
Boyfriend: Who should I be for Halloween?
Girlfriend: Be Heath Ledger's Joker.
Boyfriend: Why should I be the joker?
Girlfriend: Because he's super hot.
via giphy
by psithurism July 26, 2016
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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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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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When you finger a woman on her period and wipe the blood across her lips and ask her: Why so serious?
When my girl was on the rag I gave her the joker.
by Mr. Nasty Nate June 20, 2009
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The joker is when you cum in a girls face and then after her make up smears and she starts crying you ask her..."why so serious?"
John: yo dude what did you get into last night?

Rusty: I totally used the joker on that girl from the bar last night!

John: Ha ha you are the man!
by Princes Donna L October 24, 2010
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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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