When you bend over and realize that you are getting pounded by another dude so you see your two balls as well as the other persons two balls which essentially makes up 4 balls all together.
I asked my dad why I saw 4 balls in total on me and he said "mijo get off you're getting fucked by another guy". rape
A nickname made by the JoJo's Bizarre Adventure for character Josuke Higashikata in part 8 of the long running manga for when he has a conversation with his girlfriend, Yasuho Hirose as a codename due to the fact he has 4 testicles.