When you fuck a girl in the butt while her head is in the toilet. After you finish, you flush the toilet and slap her ass while saying "thats why they call me dirty mike!"
A no wipe post diarrheabutthole party (wet or dried). May include : Anal, RimJob, Fingering, and Face-sitting.
Even though she had the runs from eating week old warm tuna casserole, she was feelin' it. I decided to give her the ol' Dirt Road Special, and boy was it dirty. I was cleaning the crust out of my foreskin for an hour.