Someone who's behavior is so
childish, spoiled and annoyingly bratty that that they are king or
queen of brats but in dinosaur dimensions. A complete shithead or
douche bag.
Paris Hilton, filthy whore, is such a brattysaurus rex for her complete self-absorbtion and disregard for
anything important.
Yeah, she is such a brattysaurus rex that she would not not
know a charitable cause if it
hit her in one of her many anal warts.