An extended version of the traditional "Good Luck, Have Fun." The additional "mf" means "motherfuckers" Therefore, its a way to be Bad Mannered at the start of a game. Best used with capslock: "GOOD LUCK, HAVE FUN, MOTHERFUCKERS!"
Bob: gl hf mf!
Fred: You Too!
by TheMotherF-er December 29, 2010

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