Headclicker or Head Clicker is used to describe someone who is very good at landing headshots in shooter-type video games. Someone who clicks heads, and lands headshots.
Jerry: Jesus Christ, that guy can't stop landing headshots!
Mikey: He's nuts man, that guy is a professional Headclicker.
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