Small to large blisters, rectal warts, lesions or other growths occurring around the rectum. Their presence gives the affected area the appearance of a potato. The darkness of the rectum serving as the dark hide of the tuberous vegetable, and the warts, blisters & lesions serve as the "eyes" of the potato. If the inflicted individual has "bleached" their rectum they are then referred to as "Golden Ass Potatoes."
I was just about to perform anal sex on this hot cougar in the bed of her truck, but when she spread her cheeks I could see ass potatoes!