-interjection, exclamation, interrogative
A contraction of the words say and what. Used in informal conversation to denote confusion or disbelief. Can be used interchangeably with the words huh
(for Canadians). First appearing in the late 80s, early 90s. Most notably used by Pauly Shore (as the Weasel) in the movie "Encino Man", and Mike Myers in the "Wayne's World" movies.
-Also can be used when cell phone conversation becomes garbled by a spotty coverage area.
Girl: Hey, hurry up. We've got to pick up some drinks. This frat party is BYOB
Guy: Schwa?! *breaks into a cold sweat*
Mom (on phone): Oh, and honey don't come home without picking up myahr... *garbled*.