Singing more than one note on a single syllable. To be used in moderation. Abused to the point of absurdity by R'n'B and pop singers (usually but not always female) as a way of showing off vocal capabilities, much like an Yngwie Malmsteen solo. Egregious offenders include Mariah Carey, Celine Dion, Christina Aguilera, and Boyz II Men.