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