When you pull your penis out and womans anal cavity and there are traces of fecal matter surround the tip of your manhood.
A: Man, i tottaly got a mud mushroom last nite while banging your sister!
B: Clean that mud mushroom of yours!
B: Clean that mud mushroom of yours!
by RichoFromRezza December 09, 2008
Get the Mud Mushroommug.