When a chick snorts up diarrhea from a chick/guy's asshole, straight up into her mouth, and then makes out with the chick/guy.
Dude, your dad gave your mom a Missouri Mudball last night? That's straight fucked up.
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when a large group of natives capture you, tie you up, and begin so slather mud/poop on your body,(commonly the penial area). after the mud/poop is slathered they bring in the tribe cheif who gives the victim a vigirous Hand Job.
Guy: hey man how was your trip to the Amazon?
Friend: it was great, i met some natives, they gave me a souvenier.
Guy: what was it?
Friend: an Amazonian MudBall!
When you poop into one's ass and they reciprocate the poop and it gains in mass as it travels back in forth.
Steve "I'm gonna poop in your butt."
Lindsay "I'm gonna poop it back in your butt"
Steve "Mudballing. Hawt."