Extreme pain/discomfort/itching of the Anal Sphincter, and is usually too sore to wipe clean. The main causes are spicy foods, very large faeces, continuous diarrhoea, or anal sex, among others. Ring sting can be made less intense/painful by applying cold water.
Andy: ''Hey, come and take a seat!''
Calvin: ''I would do, but this Ring Sting is unbearable!''
Andy: ''Dam! I told you not have an Indian takeaway, AND get it up the ass from that huge black guy!''