Blimey Guv’nor

A 2007 case study showed some older doctors were confused by British street slang, to the point where they suspected schizophrenia:

It was thus unclear whether he was displaying subtle signs of formal thought disorder (manifest as disorganised speech, including the use of unusual words or phrases, and neologisms) or using a “street” argot. This was a crucial diagnostic distinction as thought disorder is a feature of psychotic illnesses and can indicate a diagnosis of schizophrenia. We sought to verify his explanations using an online dictionary of slang ( To our surprise, many of the words he used were listed and the definitions accorded with those he gave.

Vaughan Bell adds his two cents.