sweating my balls
If somebody desires physical interaction of a sexual nature with you, they are sweating your balls.
"See that chick over there? She's totally sweating my balls"
No sweat off my balls.
No problem for me. No big deal to me.
Sobody you don't give a shit about doesn't invite you to their wedding. Your response: No sweat off my balls.
No sweat on my balls
Can easily do something
I can dunk on you with no sweat on my balls