A person of significantly low mental status, originating from douche bag. The letters are switched to signify that the person being insulted is even more retarded than a douche bag.
A small appetizer, usually served in fancy French or "Asian Fusion" restaurants before the waiter/ress takes your order. Sometimes one, sometimes as many as three small bites, showing off the chef's skill in creating and blending flavors.
I went to Cafe del Rey yesterday and they had the most amazing amuse bouche. I popped it into my mouth an d it was like being in heaven.