Top definition
A "sexually" transmitted disease which can only be caught by sitting on the seat of a wagon that someone who already has fish wagon has sat upon.
Characterized by foul odour and a tendency to develop tentacles
Also used as an insult.
"Guys, I think I've got the fish wagon... I knew I should have used that protective wagon-seat cover."

"You fish wagon! You stole my girlfriend!"
by Kenshachan May 16, 2007
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