Speak American?

Highfalutin
adjective, informal

Characterized by an exaggerated show of dignity or self-importance: grandiose, hoity-toity, pompous, pretentious, puffed-up, puffy, self-important.

(I bolded my favorite synonym.)

Answers.com notes: REGIONAL NOTE H.L. Mencken, in his famous book The American Language, mentions highfalutin as an example of the many native U.S. words coined during the 19th-century period of vigorous growth. Although highfalutin is characteristic of American folk speech, it is not a true regionalism because it has always occurred in all regions of the country, with its use and popularity spurred by its appearance in print. The origin of highfalutin, like that of many folk expressions, is obscure. It has been suggested that the second element, –falutin, comes from the verb flute—hence high-fluting, a comical indictment of people who think too highly of themselves.