Dictionary.com's Word of the Year is...
Something very successful and impressive; a sensation; wow1: It would make a wowser of a movie/ The four-beat peroration is a wowser
[1928+; fr wow, perhaps influenced by rouser]
A stiff and puritanical person; a prude and prig; killjoy, party pooper •Now outdated and sure to be confused with wowser1: men of letters, who would swoon at the sight of a split infinitive, such wowsers they are in regard to pure English
[1899+; origin unknown; claimed in 1899 by John Norton, an Australian muckraking publisher, as his coined acronym for the name of his organization We Only Want Social Evils Righted]