Top Definition
Mud But is the way you feel after you've had McDonalds for breakfast.
I just had a B.L.E.T. Bagel from McDonalds and Now I've got MudBut. I'm pissing through my asshole.
af Paul Maletic 5. december 2008
2 more definitions
when one farts and it sounds like they shit themsleves.
Justin must have mudbut, because it smells like shit.
af Jrue 29. januar 2009
A Mudbut is a small mythical woodland creature found in rural central Pennsylvania. This creature is slightly smaller than a cat and extremely fuzzy. To see this animal would remind you of a koala bear mixed with a household cat. It gains its name by the sound it makes which is in a very highpitched light voice it say "mudbut"
Holy crap there's a mudbut!
af big willy mcClain 27. april 2006

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