What is Dead Horse's Ass?
1.
saying that means what you are asking for is absolutely not going to happen.
When somebody asks for something that you're not going to give them or do for them, your response is "Sorry, but I'd say you're looking up a dead horse's ass"
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1.
The tiny beads of sweat accumulated on a person's upper lip on a hot day
I had a major sweatstache yesterday
See moustache, sweat..