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1.
A night in which folks get together for the ultimate purpose of getting laid (i.e. engage in sex with someone). Game night is more than a game, it is a philosphy and a state of mind. Game Night isn't hanging out with people and just having fun; it's about going on a mission.
Ben, Paul, Will and Jack got together and went downtown Friday night. As they realized it was Game Night, these guys wasted no time going about mugging down on some hoes.
by ChangBangHer June 30, 2005
 
2.
game night increases the chances of winning a hockey game dramatically; namely, the Vancouver Canucks. the more people you have, the higher the chances of winning.
A: Dude, game night at my place?
B: Yeah man, we're definitely gonna win then.
by hockeymaniac April 28, 2011