Top Definition
When two men are going to town on a womans boobs and they get so carried away that they accidentally headbutt each other.

A North Carolina Headbutt is a good thing.
Guy 1: Dude, me and a buddy were motorboating Courtney so good last night that we did the North Carolina Headbutt.

Guy 2: You motorboated on Courtney?

Guy 1: Who hasn't?

Guy 2: True dat.
by A Motorboating Son of a Bitch January 25, 2008
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