vowelarrhea
The tendency of contemporary singers to drag out the last word and/or note in a line by singing vowels, mostly a's and e's, over and over. The effect is enhanced by also going up and down the musical scale in an almost random, even chaotic, fashion. This can also be highlighted with the singer's hand whipping up and down following the notes sung.
The two finalists on "American Idol" have severe cases of vowelarrhea.