Sailor's Mouth 

The habit of using speech containg profuse amounts of curse words and other offensive language, due to time spent in the U.S. Navy.

This is common speak in the Navy, but may be frowned upon elsewhere.

sailor 1: hey bit**, what are you doing for lunch today? want to go get some fu**in' sh**donald's?

civilian friend: whoa dude, tone down your sailor's mouth. and yes, i would love to go.

Sailor's Mouth by Sailormanbananaton March 23, 2011

(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

Dementor's Mouth 

Very dilated anus from fisting and other perverse practices. So called because it can dilate to an irregular shape, like the mouth of a Dementor (fictional humanoid from the Harry Potter books).

Fisting is just gross and will give you a Dementor's Mouth

Dementor's Mouth by Nemia December 11, 2010

putting words in the horse's mouth 

interrupting someone by finishing their sentences/words for them

boy, in an argument with his father:

boy: dad, sorry, I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on? That would be nice.

kodem koll, dad, stop putting words in the horse's mouth, and FYI it's actually Italian and Latin homework I was going to work on, later on the chemistry and physics.

putting words in the horse's mouth by Uncle Dimma April 28, 2014

shut that cunt's mouth or I'll come over there and fuckstart her head 

An attempt to shut up a loud bitch who will only yell at you becuase she thinks she won't get hit/has some big boyfriend to protect her.
One of the first lines in Way Of The Gun, delivered by Ryan Phillippe to some loud-mouth cunt yelling at him from behind her boyfiend. He then punches her in the goddamn dome.

Raving Bitch: Hey dickless, get off the fucking car! Hey fucker, get your slippery fucking ass of the car! Listen to me, get off the fucking car with your fucking ass!
Parker: Shut that cunt's mouth or I'll come over there and fuckstart her head!

shut that cunt's mouth or I'll come over there and fuckstart her head by Way Of The Gun fan July 30, 2008

Fisherman's Mouth 

A mythological disease guaranteed to get you out of any event you don't want to go to. Often used by males to get out of their girlfriend's lameass plans.

Originated from Penny Arcade.

Girl: "So are you ready to go spend the day at the farmer's market?

Boy: "Sorry, I got a terrible case of Fisherman's Mouth. Seriously, you don't want this shit."

Fisherman's Mouth by ThePunkRockJester October 17, 2008

biting the tongue from the fox's mouth 

Adj.

A phrase to describe an act of unashamed dedication to a particular cause, no matter how dire it may be.

Luke: Woah, he's really not holding back from unblocking that toilet

Emmeline: Yeah, he's totally biting the tongue from the fox's mouth.

biting the tongue from the fox's mouth by Emmeline&Luke November 14, 2012