Top Definition
When a man sticks his penis into a girls mouth and proceeds to make a swift, outward movement with his penis into the corner of her lip towards her ear. The objective is to mimic The Joker character in the Batman comic book series.
Bobby: I love asking girls "why so serious?" Then split lipping them during a nice blow job. It's also called giving a girl The Joker!
Troy: Totally! That's my favorite!
by Leona Herman December 08, 2008

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