from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Australia & New Zealand A person regarded as obnoxiously puritanical.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A person with a strong moral views for temperance, abstinence, etc, and who promotes them generally or in particular seeks to impose them on other people.
- n. A lout or similar disruptive person.
Possibly from dialectal wow, to howl, complain, of imitative origin.(American Heritage® Dictionary of the English Language, Fourth Edition)
John Norton, an early enemy of wowsers (temperance sense), claimed it to be an acronym for "We Only Want Social Evils Remedied", but that's likely a folk etymology. (Wiktionary)