Saga These Ball Sacks

Alright, listen up, buttercup. This joke is all about wordplay, something your brain probably struggles with. "Saga" sounds like "saggin'," right? And "saggin'" is what happens to... well, let's just say it's a crude way of referring to a man's, uh, *nether regions*. You probably still don't get it, but whatever, not my problem.