chin music

Etymology
The name jokingly refers to "playing" the mouth as if it were an instrument.

Noun

 * 1)  A fastball thrown near the batter's chin, often to set up a subsequent pitch thrown low and outside.
 * Jones backed Smith off the plate with a little chin music.
 * 1)  A bouncer aimed near the batsman's chin.
 * 2)  Idle talk; chatter.
 * 3)  Rhythmic singing, usually to nonsense syllables, in a style partly inspired by the instruments used to accompany folk dancing in Irish and Scottish traditions.