It is thought to come from "guappo", a word meaning someone who is arrogant - and not, as is sometimes suggested, anacronym
for" with out papers" in reference to Italian emigration to the US in the late 19th century.
Many of these symptoms can be identified and memorized by using an anacronym
I borrowed from the dive industry; "CON-VENTID".
The dictionary includes the words "Skanger" and the newly recognised word of "BIFFO", one anacronym
of which is: "Big Ignorant Fellow From Offaly".
Their rivals have reduced this to the anacronym
P in the WC.