An adjective used to describe something that tastes incredibly sweet and sugary. It comes from the name of candy in Mackintosh's Good News known as a "savoy truffle. It was later used in the Beatles' song "Savoy Truffle" which George Harrison wrote. It is best described as a synonym for the word "sweet".
"You'll have your teeth all pulled if you keep eating all of that savoy food."
"His cakes are usually quite horrible, but this one was surprisingly savoy."