I'll be a sumabitch, this shit is spot on. lmao Dirty Vincent
A Skid mark of substance, left behind from a very wet sloppy loud and long fart. Generally in a "V" shape as it exits the butt crack with great force up your back.
Mom: "Look at these shorts whats this big brown V"
son:" Mom thats my dirtyVincent, i got it after you fed me those tacos"