One who has extreme skill at paintball, very hard to eliminate, or as the letters and number symbolize "hard to kill". This term originated from the depths of paintball in the SO Mich.
Ollie Lang was H2K but then he played for ironmen and dynasty rolled him.
H2K stands for Hard 2 Kill. Also, it's a clothing line/design company created by Toledo, OH native, Carl Markowski, a professional paintball player. Although a lot of H2K gear got sold to fellow paintball players and whatnot, it's not JUST for paintballers.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi