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2.
The act of "blowing ones load" inside the rectal cavity of another. Immediately thereafter you suck or slurp the load out of the anus.

The optional add-on is to then spit the ejaculate into your partners mouth.
I got into a weird mud bugging scenario with Tara last night. Needless to say I'm out of scope.
by Eventide October 18, 2010
 
1.
Similar to motorboating, but done between someone's ass cheeks. When someone places their mouth between someone's ass cheeks and then shakes their head violently while making motor sounds with their lips.

As coined in Episode 86 of the Wheels Off Liberty podcast by one Jamie Crane.
I've been mudbugging so much that I can't even smell shit anymore!
by XOmniverse June 02, 2011