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Similar to a Wet Willy except you are sticking a penis in someone's ear, not a wet finger.
Guy: Man, Frank schooled Bob by giving him a Wet Johnny!
Guy2: Is Frank gay?
by Matt Crabbe September 15, 2007
when you are in a bathroom stall, take a large amount of toilet paper or paper towels (anything 'dunkable'), dunk it in the pissy/shitty water, and throw at target.
Guy 1: timmy threw some wet paper towels at me while i was taking a dump, so i gave him a wet johnny right in the face!

Guy 2: it's the only proper revenge for being hit with a wet paper towel while pooping.
by big daddy sex penis January 08, 2010