BG in video games means "Bad Game", which indicates a player's dissatisfaction with a certain game or their own actions or results in it. BG can be used in chat or in comments about the game to express disappointment, frustration, or dissatisfaction with match results, game quality, or the behavior of other players. For example, if a player feels that the game was unfair or just a failure, they might write "BG" in the chat after the match ends. To denote a good game, GG is used.