Tardfolk
A specific genus of otherkin, defined as individuals who strongly identify with mentally retarded people, and who adopt the mannerisms, behaviors, and intellectual limitations of the mentally retarded in an effort to better assimilate into their ranks, often with laughable results, intentional or otherwise.
BREAKING NEWS: A man broke into the lion pen at the zoo today and ran around inside for several minutes, playing a trumpet really loudly, before finally getting mauled by several of the feline occupants, and barely escaping with serious injuries. When the authorities interrogated the man about his motives, he stated “this was my initiation into the tardfolk”.