Rectalgia is a medical term meaning a pain in the rectum. You can see where this is going, it can be usefully applied to people who are a pain in the arse, you know the WOSPs, Malcolms and fuckwits of the world. See also pygalgia.
There are some people whose mere existence causes acute rectalgia.
Originally a medical term, rectalgia is a pain in the rectum, now being applied to people who are a pain in the arse.
Malcolm, with his clumsiness and stupidity causes acute and widespread rectalgia