blurtmouth 

When you can’t stop yourself from saying something you wish you hadn’t said.

The nominee appears to be suffering from a serious case of blurtmouth.

blurtmouth by Dr Bunnygirl September 27, 2018

Buttmouth 

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.

Buttmouth by Fecal-Mouthed Cretin August 7, 2017