person who is abnormally obsessed with his five oclock shadow.
Damn mutts, they always up in here pullin that stupid sh*t and sh*t.
by Rex Dixon May 21, 2022
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Commonly used in Ireland as a slur to describe someone who has one parent that is catholic (nationalist) and another parent that is protestant (unionist)
Daniel you mutt
by Foggierpath November 28, 2019
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A Mutt is a dirty slut who fucks men (usually drug dealers) for drugs, money or to robb them
Bro that fucken Mutt stole all my gear and my gold!
by Captain C-Walker November 16, 2021
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Mutt is an insult in general or abbreviated word for dirty or rachet.
“Fuck you’re a mutt cunt aye” “Oi that’s pre mutt bro I wouldn’t touch that”. A longer example is “got any cones bro I’m out?” “Nah bro”, “mutt”
by ConeLord April 12, 2021
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Mutt is a comic strip character from 1907-1930; his Comic, Mutt & Jeff, was the first to use multi-part Serials
Mutt, the cartoon character from '07 to '30 whom was widely recognized 'till 1919 as A. Mutt; like when some-one says: 'Boy, am I a MUTT!'
by A Man Whom Just Submitted March 23, 2022
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This is a common slang in South Florida that means to be doing too much. Generally this excessiveness is followed by either feeling like a bully or that you overreacted.

If you mutt often you’re either a very scary person or you feel a need to defend yourself often and overdo it. Also, if somebody says you mutted then they most likely would want you to stop that behavior.
Ex 1:
Person 1: Yo did you hear Josh shot that gas station clerk dead during the robbery.
Person 2: Damn what’s wrong with Josh, that man mutted.
Ex 2:

Person 1: I’m gonna talk to Ian since I don’t like how he was speaking to my girl.
Person 2: Alright that’s fine, just try not to mutt and start something.
Person 1: Shut up, he was talkin to my girl, I’ll mutt if I want to.
by South Florida Slang January 15, 2023
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