Define You're Breaking My Balls Meaning

You're Breaking My Balls
Similar to the phrase 'my balls', it is the longer, more informative version for those idiots who haven't ever heard the phrase.
Used many times by Eric Cartman in the show South Park

John - Here I have a new, mint condition guitar.

Rob - Oh! I'll pay $120.

John - $120? You're breaking my balls, man.
By Bessy