Term used in the twitch chat of competitive overwatch streams. It describes people who say dumb things in chat thinking their an expert in the game, but actually don't know what they're talking about. The term makes reference to the platinum rank in overwatch, a rank where there is a stereotype that players think they're better than they actually are.
Plat Chat: C9 LUL
Other Viewer: Not a c9 plat chat
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