A perpetual wipe is after you drop a steamin load in the John, and, unbeknownst to you, the wiping process will seemingly never end. An unspeakable amount of toilet paper is used, along with several flushes along the way, to avoid clogging of any sort.
Jim: Hey José! where have you been? I have been waiting for at least 30 minutes!
José: Sorry, I was just dropping a shit, and then I realized I was stuck in a perpetual wipe