brazilian = someone who changes fonts and text color frequently
lamer = someone who sucks so bad they don't get that everybody else is in therapy just to tolerate them
teh gay / teh gai = "the gay" meaning stupid or pointless, as in people who pronounce pwned "p-owned" are teh gay
OHai!***K!ThxBai! = "Oh, hi!" /stupid message, always lacking spaces/ "Okay, thank you, good bye!" Currently used mostly to imitate the preteen chat/texting kids who don't know their native tongue, but it wasn't too long ago you saw it more from the imitatees.