Mouth Dirt

The nasty bits left on floss after being used.

When you don't use your teethpaste.

"Man, you need to brush and floss your mouth dirt away. Your face smells like sewage."

Restaurant Mouth

A medical condition in which one uses foul language after a shift working within a restaurant due to excessive use of vulgarity within said restaurant.

Sherri: "Hey honey, how was work?"
Mike: "Fucking terrible. Just fucking terrible."
Sherri: "NOT AROUND THE KIDS, MICHAEL!"
Mike: "Sorry, I guess I still have restaurant mouth."

soap mouth

Someone who suffers from the genetic defect that makes Cilantro taste like soap.

"Get a load of that soap mouth picking the cilantro out of his tacos!"

Mouth Stew

When you jizz in her/his mouth right when they through up

Dude last night I made a Mouth Stew

Mouth Water

A step beyond mouth-watering. Something is so desirable that it is literally mouth water.

A noun used to refer to something extremely good. Typically used to refer to non-food items or ideas.

Used in a similar way to "fire" i.e. 'that shit is fire.'

(1) 'Steph Curry's jump shot is mouth water"

(2) 'that ass is mouth water'

(3) 'The latest draft of the financial plan is mouth water'

sucker mouth

Someone that is greedy and selfish; hogs everything for themselves and kills the sh*t out of it

Javier is smoking the blunt to a roach

Javier is a sucker mouth ass nigga

winner's mouthful

The final mouthful taking by a competitive eater or, more crudely, the pay off at the end of oral sex

Dave grabbed the chunk of kielbasa to ensure he had the winner's mouthful ahead of Jane, Peter and Samantha.