Scat singing
Scat singing is vocalizing either wordlessly or with nonsense words and syllables as employed by jazz singers who create the equivalent of an instrumental solo using only the voice. Thus it is a type of voice instrumental.
Scat also refers to the sexual fetish known as coprophilia, but scat singing is much cooler.
Definition from Wikipedia. It's worded well.
Synonyms for scat singing
On this page, you will find 30 slang terms related to Scat singing. Some of the top words include: lolerkeeklewaffleberryskatez, Wozzy, quack, poo-play, Fecophilia, and 25 more.