What is "what's it to you"

phr. 1 (context defensively English) Why are you asking? Why do you want to know?. 2 mind one's own business; it's none of your business.

"What's It To You" is a debut song written by Robert Ellis Orrall and Curtis Wright, and recorded by American country music singer Clay Walker that reached the top of the Billboard Hot Country Singles & Tracks chart. It was released In July 1993 as the lead-off single from his self-titled debut album, and became Walker's first Number One single.