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.
According to Cassidy, the phrase drag racing comes from Irish phrase de ráig, meaning suddenly or precipitately.
Explanations involving the Englsh word drag range from a simple challenge (“Drag your car out of the garage and race me!”) to geographical locale (the “main drag” was a city’s main street, often the only one wide enough to accommodate two vehicles) to the mechanical (to “drag” the gears meant to hold the transmission in gear longer than normal).
De ráig is a real phrase but is quite uncommon and is much less appropriate as an origin than the English word drag, which is obviously a lot closer in sound as well.