"Gras bra" is a malformed version of gracias brother, which is slang for the common phrase Thank You. "Gras bra" first saw widespread use in the Pacific Northwest, especially in Ashland, Oregon. Notable users of the term include Joel Seinfeld, Brady Brim-DeForest, Malcolm Holt, Sol Weisbard, and Brandon Hale. The term has since spread to small pockets in Los Angeles and New York City.
by Brady Brim-DeForest April 28, 2004