The resonating echos of a thunderous bowel movement; inevitably when one wishes to remain discreet, such as when one is in his new girlfriend's apartment, or a public facility, or what have you.
"I walked in the bathroom without knocking. It sounded like a craparia going on in there!" I thought she was so proper and polite, but she's fecking repulsive! I can't continue seeing her! Smelled like someone was gutting a pheasant!"