Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun informal, dated One who speaks in an unclear, muffled, or sluggish manner.
  • noun informal, dated One who speaks in a glib manner with the intent of deceiving or manipulating others.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

flannel +‎ mouth

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