When your balls pop out of your pants or boxers and you surprise someone.
The button ripped off my pajama pants and I gave my in-laws a peekaboo ballsack.
Person 1: *is annoying*
Person 2: Stop buttering my ballsack!
I haven't had sex for a long time so i have a raisin ballsack
A person who grabs and scratches your balls for you
I need a ballsack fingerer because my balls have been itchy lately.
a man that has giant hairy nuts but his ballsack is fire