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Definition of Mlky : 1. (Noun) slang for being retarded. synonyms: turtling, foolish, dumdum, aloof, brain farted, dork, cool, quirky, cringe, unlikeable, asshole, little bitch, worst jokester. 2 (verb) One of the few words you can use in any Mlky situation and still make Mlky sense. "Thats a Mlky!" Interjection Slang: Vulgar / Offensive. (used to express anger, disgust, confusion, peremptory rejection, etc., often followed by a pronoun, as you or it.) (often in exclamatory phrases such as you're such a Mlky! HIS DOING A MLKY! etc)
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