For some time now, some of my on-line friends have advised me to provide a version of CassidySlangScam without the invective aimed at Cassidy and his supporters. In response to that advice, I am working on providing a glossary of the terms in Cassidy’s ludicrous book How The Irish Invented Slang with a short, simple and business-like explanation of why Cassidy’s version is wrong.
In his etymological hoax, How The Irish Invented Slang, the late Daniel Cassidy claimed that ‘skedaddle’ (meaning ‘to run off’) comes from the Irish sciord ar dólámh. Of course, as usual with Cassidy’s claims, sciord ar dólámh isn’t found in Irish. It isn’t a recognised phrase. It is not found in any song or poem or prose work. Cassidy invented it by putting together words he found in a dictionary. It might mean something like to rush with both hands. Even if it did exist, it wouldn’t sound much like skedaddle and there are plenty of well-known expressions in Irish which mean to run off or run away.
Furthermore, the experts tell us that skedaddle is an American version of an English dialect word scaddle, which also means ‘to run off.’ This word is actually attested and it is also found in the English of Ulster (according to the excellent Concise Ulster Dictionary).