break (someone's) ballsand break (someone's) stones; bust (someone's) balls; bust (someone's) stones
1. Sl. to wreck or ruin (someone); to overwork someone; to overwhelm someone. (Potentially offensive. Use only with discretion.) The boss acts like he's trying to break everybody's balls all the time. No need to break my balls. I'll do it!
2. Sl. to kid or tease (someone). Don't sweat what I said—I was just bustin' balls. Hey, relax, he didn't mean it. He was just breakin' your stones!