Sapporo itchybum Share definition Flag The feeling in your anus after consuming copious amounts of sapporo itchiban noodles. I just ate 3 packages of noodles. Now I can't get rid of this Sapporo itchybum. Lucky for me, I ate them cooked! Sapporo itchybum by Ismellstupid December 8, 2011 Get the Sapporo itchybum mug.