Peekaboo ballsack Share definition Flag When your balls pop out of your pants or boxers and you surprise someone. The button broke off my pajamas and I gave my in-laws a peekaboo ballsack. Peekaboo ballsack by StyreneOxide March 16, 2020 0 0 Get merch Get the Peekaboo ballsack mug. Buy Now — $32.95 See more merch