[Sethomas]

But if Buckethead is with BOTH Les Claypool and Bootsy Collins... well, that's like having a chick squat on glass table and shit while you lay underneath

I understand the image that's being expressed, but I have no idea whatsoever what actually meaning is intended to be conveyed.

To me, you may as well have said, "if Giuseppe Gentile is with BOTH Kofi Annan and Marylin Monroe... well that's like having a man in a Big Bird costume bludgeon a small child as you drink a Slurpee."