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Noun. Originally Miami's Ugly Girl(s). But, now that the term is used more generally, its new definition is: Mad Ugly Girl(s). MUGs are usually to be avoided, though they have certain uses. Examples of their functions include; cup holders, gag inducers, and, at times, sources of comedic entertainment. Other forms of MUG include; MUGgy (environment filled with MUGs), MUGgy (adjective or adverb form of MUG), MUGish (partially MUG like), and MUGish (adjective or adverb form of MUG)
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