I have a question, are you on a septic or city sewer system? I would also add that you should post this query on the Plumbing forum.

Clog slowly burping in the drain?

Try a plunger.

Saucy

You waste pipe might not be vented. That causes a slurping or gurgling noise as the water does down the pipes. Common in older houses.

I don't have anything to add to this. I just wanted to see why people resurect nine year old posts.

Maybe you can tell US?

Usually because they have something to add to it! :-P

I, too, have nothing.