mealy mouth 

Someone who speaks indirectly and bowdlerizes. One who beats around the bush.

The opposite of a "mealy mouth" is a "smash mouth", someone who "tells it like it is".

mealy mouth by LudwigVan February 1, 2005

(straight) from the horse's mouth

Getting information from the highest authority.

Origin:
When you get a tip for a horse race, the tip is better as nearer it is to the horse e.g. the jockey or the trainer. When you got it straight from the horse's mouth, you have it directly from the source.

This tip is foolproof, I got it (straight) from the horse's mouth!

(straight) from the horse's mouth by TheSunToucher August 12, 2009

bollock mouth

An insult meaning that someone is talking a load of shit.

Shut up bollock mouth

bollock mouth by Waddo November 3, 2007

sauce mouth

One who takes a penis in the mouth and enjoys it.

"Brittney became a sauce mouth on the rock at summerfest."

sauce mouth by sauce mouth April 3, 2009

Missy Mouth

The constant use of foul language intertwined with normal conversation. "Potty mouth"

Melissa: "My kid's soccer coach is such an a**hole! I can't f**king believe that he pulled my kid from the game! I'm gonna go kick his f**king ass!

Jim: "There you go with your Missy Mouth again!"

Missy Mouth by SCNow January 16, 2010

Sphincter Mouth

Very deep verticle wrinkles around a persons mouth. Typically seen on females who are heavy smokers.

Deb: Oh my, your friend Sally's mouth looks like a spincter.

Janet: Well what do you expect...she smokes like two packs of cigs a day, she's bound to have a sphincter mouth.

Sphincter Mouth by Saurus-rex March 16, 2011

C+ Mouth 

A mouth not really suited for oral pleasure.

That kid wanted a higher grade in my class but his mom only has a C+ mouth.

C+ Mouth by Liberal Arts Prof June 14, 2011