Split Lipping

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!