pumpernickel Share definition Flag a word to express anything supa-dupa-fly, bombastic, bomb-biggity, or boom-diggs. Also used to describe bomb chronic eh yaw, that shit is SOOO pumpernickel. (alternate slang = "pump-nicks" or "tha pumps") pumpernickel by Pumpernickel Posse November 18, 2003 Get the pumpernickel mug.