Noun. When someone doesn't wipe their ass well after taking a shit or at all, then proceed to go about their daily business. In conclusion, it is usually resulting in the interior portions of the ass cheeks glommimg many remnants of fecal matter.
Tell me why in Harold, Chuck, and Demon are the only people on the crapper in Friday the 13th movies who finish their business and don't wipe. I bet you they have enormous amounts of mudputty!