Wowser

"Wowser" is a term that originated as a slang expression; it is most commonly heard in Australian and New Zealand English. "Wowser" refers to a person who seeks to deprive others of behaviour deemed to be immoral or "sinful".

The term originated in Australia, at first carrying a similar meaning to "lout" (an annoying or disruptive person, or even a prostitute). Around 1900 it shifted to its present meaning: one whose sense of morality drives them to deprive others of their sinful pleasures, especially liquor. The term was particularly applied to members of temperance groups such as the antipodean branches of the Woman's Christian Temperance Union.

John Norton, editor of the Australian scandal newspaper, Truth, claimed he first used the word in 1899, a claim supported by the OED. However some authors claim that the present meaning originated from an Australian temperance slogan, "We Only Want Social Evils Remedied." This apparent backronym is considered a "less credible provenance" by the ANU.

The Australian writer C.J. Dennis defined it thus: 'Wowser: an ineffably pious person who mistakes this world for a penitentiary and himself for a warder'. Historian Stuart Macintyre argues:

"Wowser" was frequently used by artist and author Norman Lindsay, who fought many battles with "wowsers" over the sexual content in his art and writing. In "The Motor" magazine w/e April 10 1940, the word was discussed, and the author of Contact column was still bemused until he received a card from a gentleman in Bristol who said "Broadly speaking, 'wowsers' are pious hypocrites, those who dislike seeing others enjoy themselves, usually in evidence amongst the elder members of a community."

Americans rarely use the word, except as an interjection of surprise. However it appears several times in the works of H. L. Mencken:

...
Wikipedia