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1.
Abbreviation for Flirty Dirty, this means that you can flirt and touch sexually with the opposite sex, but not punch or abuse.
Guy 1: "Yo, Rhi's coming over later, going to be some serious beatdowns going on"
Guy 2: "naa man, F's and D's only!"
Guy 3: "FLIRTY DIRTY!"
by EffandDees January 31, 2010