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1.
This term orginally pioneered by the Great Sessorous and Sayre of the Crushridge Server, used to identify the tattoo worn above a hot female’s ass, it is derived from World of Warcraft, where the hunter uses this ability to mark his prey. Much like males in R.L. (Real Life) wish to mark the ass of a female you would like to “bang the shit out of”.
"Did you see the Hunter's Mark on her?"
"Yahhh boooy, I'm about to activate my Rapid Fire, and Aimed Shot that booty till there's NO HP left".