What's on your mug?

Synonym for upset, taken from "that chaps my hide"

Aww man, I'm gonna' go home and my dad will get the red ass.

By cparx

as a noun, red ass refers to a person that has a bad temper, as an adjective, red ass describes an angry person (man, that guy has the red ass) and has levels depending on how angry the person is (red ass, red hot ass, red hot chili pepper ass).

Noun: Mike Tyson is a red ass. Adj: That guy has the red ass.

By Q

In Texas: one who is beyond being a bad ass, one who will do whatever it takes to get the job done and will shoot first and ask questions later.

Don't mess with Johnny, he's red ass, you know.

By Gil

Being pissed off or irritated.

Damn dude, your breath gives me the red ass. Your Mom's fat ass give me the red ass.

By Irish Cajun

Someone who is constantly complaining or picking a fight over perceived injustices. I first saw this usage in a Sports Illustrated article about the baseball manager Lou Pinella. In the article Pinella, who is notoriously bad about arguing with umpires, referred to himself as a red ass. I liked the term so well, and it applied to some in my family, it was entered in to the family lexicon.

My father yelled at the waiter for bringing the wrong order. He is a real red ass.

By Eric