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.
Nobody knows where the term fluke comes from. Some of the theories are discussed here:
The late Daniel Cassidy, in his book of false etymologies, How The Irish Invented Slang, claimed that fo-luach means “a rare result, a rare reward, a rare payment, an occasional payoff”. Fo-luach (or foluach) does not exist in any dictionary or in any Irish text. If it existed, it would be a translation of ‘a subsidiary value’. Irish has several words for a windfall, of which amhantar would be the most common. Cassidy invented the ‘rare reward’ meaning by taking the most obscure dictionary definitions of the prefix fo- and the word luach and combining them. This ‘Irish’ word is a total fabrication.