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an ugly chick who is fat and described as a meany. she's uglier than a tiny hairless dog and thinks she's way cooler than she is when really nobody likes her big cause she's so fat. generally a mutty girl has acne or is a cake face! we like to think that they have wide sets too
man, that chick is mutty
mutty by her hoo ha December 21, 2010

Mutt Mutt 

A individual who does not abide by the rules and acts in a more dogish manner towards authority and others and also acts dumb in serious situations but dont necessarily call them a dog but call them a mutt mutt
Damn dude after you got drunk last night you tried scoring with my sister but then she called you a mutt mutt and turned ya down so you got with the fat chick.
Mutt Mutt by Mutt Mutt January 11, 2017

Matty Matty the Big Daddy 

Matt is a sometimes nice boy when its not the homecoming night. He spends most of his time creeping on facebook. He has a special liking towards freshmen girls and inappropriate crushes on most boys.

Despite this, he is very handsome and can pull off almost any haircut. Whether it be bald or mohawked, the big daddy is always looking fresh.
His favorite past time (besides facebook creeping) is being with Danielle because he loves her taste in tv shows and doesn't smell bad like the rest of his friends. Matt is a sure stud and a definite keeper as long as its not homecoming.
"how did Matt get that nickname?"-Danielle
"let's just say they dont call him matty matty the BIG daddy for nothing"-Caroline
Matty Matty the Big Daddy by DV-Dubs November 15, 2010

MUTT MUTT FLAPS 

FRUMPY HOO LIPS,PUFFY MEAT CURTAINS THAT DANGLE FREELY
KIMMIE'S MUTT MUTT FLAPS WERE SLAPPING MY NUTS DURING DOGGIE STYLE

Mutt mutt 

He stuck his penis in my mutt mutt!
Mutt mutt by Jewel2400 May 1, 2018

mutt looking mutt 

very common when referring to people who you aren’t on good terms with. generally used when you dislike someone for how they act or treat others.
basically if ur a deadset cunt of a human, most aussies will call you this, you fucking mutt looking mutt skank mf
that skank over there is a mutt looking mutt for double parking the cunt