Lexicography
The first recorded use of the term was in 2002: "It was never guaranteed that the wives and girlfriends (or "the Wags", as staff at the Jumeirah Beach Club call them for short) would get along. Mrs Beckham's tongue, for one thing, has previously run away with itself."
In 2006 it was generally printed as "WAGs", but a singular, "Wag" or "WAG", quickly came into vogue (even though the singular form would logically be "wife or girlfriend", reading as "WOG"); for example: "any additional pounds she gained during Wag drinking sessions"; "a property heiress, model and actress, appears a likely sports WAG". Susie Dent's annual Language Report for the Oxford University Press (2006) capitalised the entire acronym as "WAG" ("wife and/or girlfriend") .
"WAG"/"wag" came also to be used somewhat tautologically ("deluxe-edition Wag girlfriend") and increasingly in non-footballing contexts: for example, the first wife of comedian Peter Cook (1937–95) was described as a "Sixties Wag" and actress Jennifer Ellison, because of her former choice of clothes, "once ... the epitome of a Wag". Fashion writer Shane Watson coined a collective noun, "waggery". One can also be "Wagged"
This type of acronym is of long-standing in British English. For example, during the Second World War, a series of County War Agricultural Executive Committees or CWAECs was known widely as "War Ags".
Read more about this topic: WAGs