That's a James Brown
lyric. He wrote that shit! He's writing a song and, "I need a word in here... Heeeaay!
A Lyrical Tic is an odd, toss-in sound found in a song that a particular singer or a band seems to make in a whole lot of their songs. Sometimes when they're used, it seems the singer is just being enthusiastic and so makes some sort of "Whoo Hoo" or "Yeah!". Other times, Lyrical Tic is used in "Oh Crap, I've forgotten the next line" moments. Whether the use of a nonsenical, random sound rather than an actual lyric makes a song better, or breaks the rhythm and the mood, is a matter of opinion.
A musical variant of Verbal Tic
. See also Scatting