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slang A series or instance of angry messages posted online, or the content contained therein, especially those targeted toward someone, as on a message board. (A "flame" is such a message.) The administrators are going to suspend your account if you keep up the flamage on the message board.
n. a flame sense 2; a series of flames and their content; writing or participating in a series of flames. The moderator has some warnings about all the flamage of late.