What Do You Mean Guy; usually used in an argumentative manner. Used when doubting or in direct contradiction of what someone just said.

Most commonly found in New England, more localized to Massachusetts. Guy is like the Massachusetts version of y'all but can be applied in more places.
Guy1: That chick is hot
Guy2: WDYMG, that chick is fucking ugly.
by ValhallaHopeful April 17, 2019
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