Flannel-mouthed Definition
flanəlmouthd, flanəlmoutht
adjective
Speaking thickly, as if one's mouth were full of flannel.
Webster's New World
Garrulous, esp. in an insincere or deceptive way.
Webster's New World
Alternative form of flannel-mouthed.
Wiktionary
Possessing, characterized by, or in the manner of speaking of a flannelmouth.
Wiktionary