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 9, 2011
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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
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When someone gets off licking cat asshole
Bob: Where is Rick going with that cat?

Tim: He's got cat's ass fever

Bob: That sick bastard!
by Ajax0013 January 7, 2012
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Catching a nasty STD from anal sex. Usually from a filthy whore or or prostitute.
What is it doc? I feel horrible and I think my cock is going to rot off.

Have you had anal?
Yes.

Was he or she clean?
No. She was a street walker and gave it up for $5 so I had to clap them cheeks. Wouldn’t you?
Ummmm. No. That’s nasty. You have the ass crack fever. Here is a script now go soak your penis in bleach.
by Dick Onchin August 26, 2020
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When you don't wipe well after a poo, and you get the itchies.
Heather didn't wipe well enough, leaving her with ass crack fever.
by ceav March 3, 2017
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