Corn palace
Another way to say butt or ass. This is more commonly used in reference to a woman's ass than a man's ass. It plays off the common knowledge that corn often survives the trip through the human digestive tract.
Example:
Jason: "Sarah is sure lookin' hot."
Tom: "She is, but my favorite thing about her is her tight little corn palace."
Jason: "Sarah is sure lookin' hot."
Tom: "She is, but my favorite thing about her is her tight little corn palace."