Toilet cough
The sound a toilet makes when you take a very large dump. After flushing the toilet, it can not handle it and all the water runs out, the overworked crapper makes a coughing sound as it tries to pass your recent donation.
I was sitting in the stall this morning and the guy next to me must be eating too much brand. He flushed and the toilet coughed like it was dying, like an old man with TB.