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To have very very very smelly nipples. Particularly smelling of rotten salmon or shrimp.
"Man, that kid Freddy just walked in. He must have fishtits!"
Fishtits by Dr. Martin P. Haggis November 4, 2008
Related Words

fishtishish 

Fistishish is a mispronunciation of the word fictitious. It means fake, made up.
I've had enough of your fishtishish bull shit.