chin music

noun4

1. •
   (informal) 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.
2. •
   (informal) A bouncer aimed near the batsman's chin.
3. •
   (slang, old-fashioned) Idle talk; chatter.
4. •
   (informal) Rhythmic singing, usually to nonsense syllables, in a style partly inspired by the instruments used to accompany folk dancing in Irish and Scottish traditions.