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1.
This term is used for a guy's night out. Almost like a rally cry. It means either getting into a fight and punching someone in the lip or getting a girl back home and splitting the other kind of lips.

"He's over there splitting lips."

"Yo, Creep is in full lip splitting mode tonight, Watch the F out!"

"Turk's gonna split that chick's lips later."
by Mess104 April 15, 2009