What is Your Ass?
1.
A term used in St. Louis, Missouri to mean "You are wrong" or "no way that can be true".
Statement: Pauley Shore is the toughest dude in Hollywood...Reply: "Your Ass"
"If you don't shut up, I'm going to knock you out!" Reply: "Your Ass"
2.
You.
The second person singular pronoun.
Your ass better eat some breakfast if we're going to go on that ride.
3.
Me.
This is your ass speaking. All hands on deck! We have a torpedo coming down the tube!