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Created by a couple, this term is similar to "<333" except relating to the number of the beast. Which is a pretty badass way to show love compared to gay hearts.
Dude: "Babe, I love you. <666"

Chick: "I love you more! <66fucking6!"

Dude: "Whatever!"
by @shitslegit and @RinaVampire June 24, 2010