When they have breasts.
When they say stuff like
With the proper capitalization and the period.
When they play teemo
Ahri all day
The name pretty much gives it away, most of the time. Unless it's one of those guys that's really girly or just like posing as a female to **** with everybody's head.
Name doesn't always give it away, apparently. Been called "bro" and "man" numerous times. Also had someone tell me my name is gay...lol.
Dunkey has some wise words on this topic http://youtu.be/fQ8vhfrZYHg
when they say glhf at the start of the game while playing support
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