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1. horse's ass
a stupid or obnoxious person(also a term of adress)
I refuse to be friends with a horse's ass like that.
2. horse's ass
The east end of a horse headed west. A stupid son-of-a-bitch.
Some people like Ed Asner's politics; I think he's a horse's ass.
3. horse's ass
n: An oblivious idiot who generally says and does things that draw laughter at him, for being such an unbelievable moron.
"Did you see blake just shotgun that beer and then piss himself? Wow, what a giant horse's ass."
4. Horse's ass
The President of the united states since 2000
Also see: idiot
5. horse's ass
Someone who is not just an ass, but a big ass, indeed, a horse's ass. Someone who really makes an ass of themselves.
Ex FEMA director Mike Brown is a Horse's Ass
6. horse's ass
Mules come from crossing a female horse with a (male) jackass. A horse's ass would be an ass kept for breeding purposes. Considered a low form of life, like a gigolo.
Can you believe that horse's ass?