#1) a confident swagger you bring out when you are about to get ready to tackle something difficult, or when you are about to take on a challenge. Or when you are getting ready to get down to hard business.

#2) When you are ready and pumped up to party really hard.
#1)
Person1: "Tomorrow's your job interview, right? Are you ready?"
Person2: "Yea son, I'm bringin' out my GAME FACE."

#2)
Person1: "You're turning 21 tomorrow. Time to hit the bars and black out, so be ready to bring out your GAME FACE."
by bubbacheesus April 30, 2009
1. that ugly look on your face when your really into a game basketball; in the zone

2. making a ugly facial expression on purpose
1. DAMN, that dude rite der must be really playing, got his game face on and everything.

2. Yo dude, do your game face.
by koodang February 21, 2005
A state of mind or demeanor that one has when they are ready to party. If you are ready to party, you have your gameface plastered on, and if you aren't you have it stashed in your pocket. A group of people who are always ready to party might be nicknamed the "gameface girls" or "gameface guys"
If you call a friend and ask them to go out, you might say.."is your gameface on tonight, or is it in the pocket?" And they would reply "my gameface is plastered! come pick me up!"
by Lindsay January 25, 2005
It is the facial expression of a person during sexual intercourse and especially during climax/ejaculation.
It can also be known as the face that a certain person puts on when around someone they are attracted to.
I better get my game face on, she is so hot right now....
by dails May 5, 2004
When being approached by a member of law enforcement. Usually said when in the presence of a paranoid individual... when riding dirty and the smell of bacon is detected
* sniff * * sniff * you smell bacon? dude, game-face
by BrownTown1 November 4, 2009
Guy: Her Game Face was so nasty eventually I just put a bag over her head.
by WillisTheRizznapper July 9, 2010