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Fat John 

A "Fat John" is a code word for the act of taking a poop. No one is exactly sure where the name came from, but it originated in Manchester, NH and has since spread. When referring to a Fat John, the you usually pretend it is a real person.
Person 1: "Dude, Fat John is about to visit me!"

Person 2: "No way! He visited me today, and boy, was he angry!"

Or rather,

Person 1: "Aw jeez, I'm about to be visited by Fat John."

Person 2: "Who?"

Person 1: "Everybody's met Fat John. In fact, most people see him everyday. Sometimes he tries to come in before you're ready, and sometimes he can just explode at you. You usually feel better after Fat John leaves."
Fat John by LeSuave April 8, 2013
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Fat John 

Extremly fat bastard who likes to grab peoples necks and swing them around
Fat John by Anonymous April 9, 2003

Fat John 

Fat John by Vortex Residents April 22, 2003

fat white john 

a very fat white girl that is usually very popular with hellcat driving blacks
“look jamal just pickup that fat white john in his hellcat
fat white john by cj2k24 April 22, 2024

Fat johnson 

A dick with a large circumference thereby appearing fat or wide.
Stan split Matty's ass wide open with his xtra fat johnson!
Fat johnson by zoobreath May 19, 2008

Fat Johnny 

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.
Fat Johnny by SlenderMarlin April 23, 2014