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1) When one is infatuated with the ass. 2) The std passed from donkeys to humans.
Wow, Chris is soo obsessed with Lindsey's ass; he's got ass fever!

Oh my goodness Kelly you performed in a donkey show?! You should get checked out to make sure you don't have ass fever.
by Blythe_Higgens February 09, 2011
1. Condiction following arousal in a female in which the ba-donka-donk becomes exceedingly warm.

syn. crotch heat
I gotta meat themometer fo' yo ass fever, biotch!
by Harrison Bergeron August 19, 2005