1. having a large mouth.
|Bill Nye and Boomerang 155: The [...] lantern-jawed, sway-backed, mangy, flannel-mouthed poet of the educated and refined East.|
2. (also flannel-mouth) loud-mouthed.
|Oskaloosa Herald 17 Mar. in Why the West was Wild 311: The mayor is a flannel mouthed Irishman and keeps a saloon and gambling house.|
|Intermountain Catholic (Salt Lake City) 5 Oct. 4/3: The same stupid vulgarities concerning [...] flannel-mouthed Irish and chicken-stealing niggers.|
|Philosophy of Johnny the Gent 79: ‘ He's a big flannel mouth rummy that's been readin’ some o' them Hawkshaw the Sleuth tales’.|
|Und. and Prison Sl.|
|Entrapment (2009) 44: He yelled over to me I was just one more flannel-mouth Polack.‘Lightless Room’ in|
|Long Day’s Journey into Night II ii: That flannel-mouth, gold-brick merchant.|
|Never Come Morning (1988) 44: He’d get them all in trouble some day with that flannel-tongued trap of his.|
3. (Can./US) well-spoken.
|(ref. to mid-19C) Amer. Madam (1981) 23: The family was always hard and fast church goers, always with its ass out of its jeans, flannel-mouthed and proper.|
4. talking thickly or with a brogue [the idea of talking with a SE flannel in one’s mouth].
|Sel. Letters (1981) 344: This damned typer skips like a stammering flannel mouth nigger.letter 1/12 Nov. in Baker|