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The act of spitting the poo that your partner unexpectedly deposited in your mouth during a rim job (analingus) back in his mouth. Some people may like this, but, in general, it is thought to be an act used to get back at a guy for pooing in your mouth without warning.
Allison: Mid-rim job, he pooped in my mouth without any warning, so I decided mud blowing was the best way to get the punk back.

Katherine: He shouldn't have at that second Fiber One bar...
by AnnieJames January 24, 2011
2 1
like snowblowing, but ... muddier
woman eats out man's ass, then makes out with man, without cleaning out her mouth
by drigz March 01, 2004
7 2