It's not wrong exactly. "Balls" is a slang term for testicles. It's not a polite term to use in public, or in a business or formal situation. You also wouldn't want to use it in front of your elders. But in a casual situation among friends, you could use "balls" if you want to.
Tennis Balls
ballls balls ballls balls this one is wrong
Balls - usually as a reference to testicles but could refer to soccer balls, rugby balls etc.
Bolas, but be careful because with 'balls' you may refer also to 'pelotas' or 'balones'.
that's just wrong mate.
maybe you need moisturiser
somthings wrong
Hell no what is wrong with you
that sounds wrong
Then you've pushed in to hard!
Because you're doing it wrong.
It's fine there is nothing wrong with it how you have saggy balls depends how old you are if you are over 45 it's means your getting older but under you just have saggy balls