Sack Back

When someone gives you a piggy back ride and your balls are on their back...raw.

I was drunk in the shower and fell. He gave me a piggy ride to the ER then I gave my friend sack back on the way there.

by Sugar Flaps August 20, 2021

Back Sack

Male equivalent of the side boob. When someone gets a glimpse of your sack from behind. The worst angle to see balls, which are quite frightening at any angle.

That asshole Carl tricked me into looking at his back sack yesterday!

by TheRealMikeD July 3, 2021