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After performing oral sex on a menstrating woman, one generally has a ring of red across their lips or mouth. Resembling The Joker from the Batman comic book series.
I ate my girl out when she was on her period and I ended up having Joker Mouth
by DYNAMITE BOY May 31, 2009
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Jun 5 Word of the Day
A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.
17th Century setting: Due to his treatment of the "French Pox" (syphilis) with mercury a merkin Gwendolyn used a Merkin to used to hide the side effects of hair loss and not alarm her husband.
by David W. Tuthill December 30, 2005
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2
A name given to some with a smiliar mouth to that of 'The Joker' from the Dark Knight
Batman: "See that Gotham citizen he had a 'Joker Mouth'

Robin: "HAHA batman good one"
by DION-88- March 01, 2010
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