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.
The word guzzle first occurs in English in the late 16th century. There is no certainty about where it comes from, though it is probably imitative, based on the sound that people make when they swallow food or drink quickly.
The late Daniel Cassidy, in his very unscholarly book How The Irish Invented Slang, disagreed. He claimed that it comes from gus óil, which he claims is an Irish phrase meaning ‘a vigorous drink; high-spirited vigorous drinking , (act of) gulping down a drink, to drink with great vigour, to drink greedily.’ It doesn’t, of course. As with his made up source for guffaw, he has placed the words gus and ól back to front. The word gus means ‘force, vigour, resource, enterprise, spirit, gumption, self-importance’. Óil is the genitive of ól, meaning drink or drinking. If gus óil existed, it would probably mean the tendency to be arrogant or fired up because of taking too much drink, not the act of drinking vigorously.
I suggest you copy the phrase “gus óil” and put it in a search box in Google. See if you get any hits unrelated to Cassidy! In fact, do it with all of Cassidy’s made-up Irish phrases and you’ll get the same results.