An extremely large rump, ass, behind, derriere, buttocks, or gluteus maximus. A "boom-de-ay" usually jiggles when the body is in motion.
by Asharu and Diderrr February 6, 2008
Get the boom-de-aymug. Get the boom-de-aymug. Get the boom-de-aymug. Get the boom-de-aymug.