Gunmouth

–noun, plural -mouths
a person who uses words like bullets, someone who shoots their mouth off, esp. tactless or provocatively.

Ann Coulter? Yeah, she's a gunmouthed psycho cunt.

Gunmouth by Youredoingitwrong March 1, 2009

machine gun mouth

Someone or somebody who has a machine gun mouth babbles idly and rapidly, to some extent, non-stop.

A person with a machine gun mouth is very annoying that you feel like wanting to punch his or her face to make him/her stfu.

YouTube video guy whom speaks very fast: Hello. Today I'll be showing you how to look more dapper........(10 minutes later)............so that you will be fancied by girls around you.

Me: Oh shit! I don't get what he is trying to say, this machine gun mouth guy!!

machine gun mouth by Le Mao February 10, 2013

gummouth 

gum-mouth (gum′ət̸h)
The phenomenon in which chewing gum is broken down so thoroughly that it releases its petrochemicals, rendering it tough and astringent. One would be no better off than if chewing a chinese dog toy. Merely chewing for the sake of chewing, the once joyful act becomes a chore.

Bill started chewing his last piece of gum, for he would sooner buy another pack than suffer from gummouth.

gummouth by Rich Lee February 24, 2009