mcmuddy Share definition Flag MCMUDDY- a term used when a dude is acting weird with his gf/SO in public this guy is usually touching her and acting like a baby most of the time. Also likes to touch her weird places Do you see David getting MCMUDDY ? yea that shit makes me throw up mcmuddy by RANDO VANDO August 26, 2022 Get the mcmuddy mug.