Gamer Girl is a female person playing videogames. Some of them can be nice, but some tend to act like "gaming dominatrix" - when they discover how all other players are interested in them because of their gender, they become spoilt. If someone does not give them any attention or treats them like male gamers(i.e. feels free to use cursing or gives them a reprimand), they unleash all their rage and disrespect on the person who did that. In formed communities they even urge others to aid them against someone who caused their discontent.
*someone curses at female player during intense game*
Choir of Gamer Girl's fans: Booo!