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1.
A mobile encasement with a toilet.
I used the cocaine in the portajohn.
by Dude. April 28, 2003
 
2.
Pouring blue kool-aid into a woman's anus then shitting into it. A common practice in Minsk, where the temps are cold but the lovin' is hot.
Man, I can't believe that she let me port-a-john her on the second date.
by Leslie Barbara January 05, 2007
 
3.
A man who has sex with a hooker in his or someone elses car.
Man ive been workin all night and got nothing but a bunch of porta johns.
by Zell Faze May 16, 2009