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1.
A disease that hamsters get where their ass is very wet and they constantly have smelly diarrhea.
Me: Dude, my hamster got wet tail and it's smells bad.
Friend: Poor little shithole.
by topthrilldragster220 December 31, 2005
 
2.
having excessive diahrea
I was on the pot with wet tail for almost an hour and then my asshole fell out.
by Robyn Gerstenslager July 23, 2003