Sixty Sixty Nine Nine

When 4 people are laid out in a square such that each is giving oral sex to one other member, and is receiving oral sex from one other member, so as to make a square chain.

Dutch: So Peach, I heard you were involved in a Sixty Sixty Nine Nine.
Peach: I was giving head to Jasmine, who was giving head to Rosa, who was giving head to Adam, who was giving head to me! It was a Sixty Sixty Nine Nine!