Used as a way to show sexual excitement online. Usually used as a hint to say when ones horny.
(Can be used by both genders)
John: DUDE. SERANA WANTS TO BANG THIS WEEKEND ;D
Matt: haha! Congrats man, finally losing ur vcard. Nice text boner btw....
Hint at being horny.
Jack: MAN YOUR JUST SOO FUCKING HOT. ;3
Hope: Hehe thanks:3 I may show you a little something later if you're still horny ;)