1. Colon is purged of all fecal matter
2. Following the purging of the colon, a small volume of urine is passed. This is due to the prostate no longer exerting pressure on the urinary tract as when the colon was full.
Failure to wait for the completion of step 2 can result in rectal discomfort, small bits of urine in the one's underwear, and the general feeling of an unsuccessful poo.