The Yooper is another term for the taint or bass. Area between your genitals and your ass. Commonly used by midwesterners, more specifically those who reside in the Lower Peninsula of Michigan.
Man, my yooper is sweaty.
Dude, when she was licking my balls, her tongue touched my yooper!
a good person although can be moody at times, caring and pretty but never realises it. people take her for granted