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 diarrhea butthole 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.
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.