"LOL" - Laugh out loud; used in funny situations
"LMAO" (or LMFAO) - Laugh my ass out
"gg no re" - Good game no rematch (what the hell?!)
"BRB" - Be right back
and random stuff like that
NOT TO BE SAID IN REAL LIFE THE WAY IT IS SPELLED. IF YOU DO, YOU'RE A LOSER.
"Stop speakin aim speak in real life n00b!"