Taking the zapstrap ballsac
to the next level, the all-in-one involves the placing of the penis as well as the testicles inside the zap strap before tightening. Not for the faint of heart.
"If I get drunk enough that someone gives me an all-in-one while I'm passed out, I may need to get that shit amputated."
"Dude, it'll already BE amputated!"