The state of having one's mouth smell, taste, and/or otherwise resemble the odorous qualities of a human anus. A colloquialism, does not require literal direct contact between the mouth and an anus.
(discussing timeline for leaving the house and the necessity to finish grooming first)
PERSON 1: Grooming is for squares. Let all the hairs grow an all the scents bring forth suffering to those within proximity.
PERSON 2: Ugh. I am not gonna go sit in a hot stuffy network closet with buttmouth. If nothing else I still have to smell it myself.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)