#2) When you are ready and pumped up to party really hard.
Person1: "Tomorrow's your job interview, right? Are you ready?"
Person2: "Yea son, I'm bringin' out my GAME FACE."
Person1: "You're turning 21 tomorrow. Time to hit the bars and black out, so be ready to bring out your GAME FACE."
matt & john- "quick ant, put your gameface on! we've had ours on for the last block just in case!"
"ok guys, we're here.. gameface"
Me playing "MAPLESTORY" or "C.O.D - 4"
It can also be known as the face that a certain person puts on when around someone they are attracted to.