Sep 2 episode - sound/dialog question

Calling all WAV-file geeks. When the plane-arium guy is partway into his speech at the kids' first visit, he says "Stars are actually made of hot gas, which is exactly what comes out of XXXXXXXX's ass."

But Cartman's noisy exit makes us unable to hear the XXXXXXXX clearly. Has anyone here done the dissection to figure out what the guy says?

In article , [email] says...

I think it's: "... which is exactly what comes out of Roger Ebert's mouth." Could be "ass" and not "mouth", cuz that would rhime, but it doesn't sound like that to me if i try to listen really good...

uXs