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
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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