Mud fin is when someone passes gas, emitting some fecal matter that gets flattened out between their butt cheeks, poking out of the crack like a shark fin.
by Lazy Reggie July 06, 2013
by The sex prophet September 29, 2016
by In2itall2 November 17, 2023
by Profit91 March 22, 2022
A big ass turd that's extremely long and wide. Trying to poop it out feels like giving birth to a baby
by somebodythatyoudontknow November 29, 2021
by goopysoup69 May 14, 2023
Darryl drives an electric car. He loves it when his girlfriend sticks one finger up his butthole while kissing him ever so tenderly, and then finishes by giving him a mud moustache.
by Corn & Rye November 15, 2022