Mouthbreather 

1. Someone who is really dumb
2. A person who doesn't/can't breathe through their nose

(The word mouthbreather is also used in Stranger Things)

Mouthbreather by A-Claire February 20, 2017

mouthfeel 

The unique feeling of a feminine penis after HRT.

Damn that dick has some good mouthfeel.

mouthfeel by MouthfeelQuinn January 7, 2019

mouthbreather 

1. literally, someone who lacks enough intelligence that they never learned to breathe through their nose.

2. a really dumb person.

In his latest work, the director has forsaken the indie audience and made something for the mouthbreathers.

mouthbreather by hedgerow September 3, 2003

Mouthfeel 

The way a feminine penis (a penis belonging to a woman, non-binary femme, or transfeminine individual) tastes and feels, especially after starting hormone replacement therapy. Coined by ContraPoints on YouTube.

Wow, I love the mouthfeel of my girlfriend’s penis when I go down on her.

Girl dick is like fine wine. You have to take your time and really savor the mouthfeel.

Can we please talk about the mouthfeel? Why is nobody talking about the mouthfeel?

Mouthfeel by venusdemon May 13, 2020

Dutch Mouthbreather 

When someone uses their mouth to inhale gaseous fecal particulate from partners chocolate starfish.

Remi is truly a Dutch Mouthbreather sommelier - he picked up hints of white truffle and corn from my fart.

Dutch Mouthbreather by Buford C Cabhash April 22, 2022

mouthbeezy 

a blowjob

Hey, I totally gave Dustin a mouthbeezy under the table last night at dinner with his parents.

mouthbeezy by ojlasers July 30, 2010

Mouth Beef

A temporary but uncomfortable oral condition that occurs when consuming crunchy, sharped-edged food, resulting in painful trauma to the roof of the mouth. Examples of common food items that cause Mouth Beef are: Antiseptically dry sourdough toast, tortilla chips (if eaten in great gluttonous handfuls), and Cap'n Crunch® breakfast cereal (any variety).

Sorry, sweetcheeks, I can't make out with you tonight; I had five bowls of Cap'n Crunch this morning and have a terrible case of mouth beef.

Mouth Beef by Cheesewich October 13, 2009