Top Definition
1) A video game or tabletop RPG that mimics a popular game, yet claims it's superior due to some degree of open source licensing

2) A chess opening where White plays the most popular opening move in the game by sending the king pawn forward two places and Black responds by mimicking his opponent (1. e4 e5)
PlaneShift and Peragro Tempus played a game of chess. What was the name of the chess opening? Open Game
door Tuxide 24 juni 2009

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When a girl is getting hit on by multiple guys, and vise versa. So it meaning that it could be anyone's chick/guy, hence the word "Open Game"
No way? Arnie and Rob are scammin on that same girl that your trying to get with? Daammnnnn... Open game son!
door -djsupagi- 8 mei 2008

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