Top Definition
A or type mouth that smells of what is known as, ass. Butt Mouth can most certainly be a way of describing an animal, such as a dachshund, who by any means, licks its own ass hole, therefore giving off a disturbingly disgusting smelly breath which is best described as, butt.
That nasty wiener dog has the shittiest butt mouth!
by Dr. Buttikiss Maximus January 28, 2012

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Any one that of or therefor who has, will, or is eating that of an butthole.
Tommy, i told you not eat my asshole out you buttmouth
by jermey September 18, 2003

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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.
by Fecal-Mouthed Cretin August 07, 2017

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