The act or instance of performing standing or sitting coitus in a public "porta-potty" with a full holding tank, to such a degree of roughness that it falls on its side, then continuing the afforementioned coitus laying in the spilled feces, urine, chemicals, and miscellaneous garbage that spilled from the holding tank as the "porta-potty" fell over.
Cletus: Went to the fair yesterday..

Billy-Bob: How was it?
Cletus: Know the bearded lady? Gave'at bitch a fat Johnny by the south exit.
Billy-Bob: Full tank?
Cletus: Full tank. She even ate the chicken wings that fell out.
Billy-Bob: Nice.
by SlenderMarlin March 17, 2014
Get the Fat Johnny mug.