A rare species of female which makes up less than .02% of the population. Under most circumstances an uggo
or is really fat
There is an even rarer subsect of girl gamer which is actually somewhat good looking to average (rating 6.0 and above). This group makes up less than 15% of the girl gamer population.
This is one predominant form of girl gamer in their society: the male gamer masquerading as a girl gamer. They make up over 33% of the population.
The girl gamer usually has an inferiority complex and will try like mad to kill you in her game of choice, but can't because of her inferior fingers. Confront with caution, as a girl gamer is able to let out a battlecry which will attract all the pitiful nerds to her position to attack you verbally.
Another note of caution is this: if you find a "girl gamer" who is willing to cyber with you, it is probably a man using a female alias in order to masturbate to your replies.
I was playing CS and there was this "girl gamer". I witnessed a rather amusing mating ritual in which 10 nerds surrounded her, protecting this "female" from opposing fire.