Patter

n.
  1. A quick succession of slight sounds; as, the patter of rain; the patter of little feet.
  2. Glib and rapid speech; a voluble harangue.
  3. The cant of a class; patois; as, thieves's patter; gypsies' patter.
  4. The language or oratory of a street peddler, conjurer, or the like, hence, glib talk; a voluble harangue; mere talk; chatter; also, specif., rapid speech, esp. as sometimes introduced in songs.