ErsatzScat is the way to go. Send a bunch of 'actresses' to Panzer for full colonic and enema treatments, fill them up with batter, chocolate, whatever, and press record.
That nut Jay Sin has come close in Milk Junkies and he has girls shooting golf balls out of their asses in Anal Acrobats 2. No dookies, just some Nike Juice 312's popping out.