When a person comes in the bathroom and rides your peenar while you’re taking a shit in the toilet, it forms the shape of the letter T almost..and mud comes from ..poop obviously.
“dude this nasty DZ girl just TMudd’d me last night, it was gnarly but it stunk!”
Common phrase at The Mountain School of Milton Academy as a replacement of the BRAINROT phrase TS PMO (this shit piss me off). It is used by people with high intellect who, instead of that STUPID phrase, they use the wise and insightful TMS PMO (the mountain school piss me off).