When the hole from your recently pulled tooth smells like a dead rodent.
Gargle some salt water and take care of that tooth socket. You have Rat mouth. It smells like death when you talk.
When a girl gives a guy head after he had just had vaginal sex with her while she was on her period, and his penis is covered in dried period blood.
"Do you want a mouthful of chili?"
Someone/something that cannot handle extreme/spicy flavors
Jim is a pansy mouth, he can't handle the taste of pepper.
Cotton Mouth Killer, or CMK, is an energy drink from Norway. It has blueberry and guava flavour, and is specifically designed to kill your cotton mouth. When your thirst is dire - an ice cold can of Cotton Mouth Killer extinguishes it like an ocean hitting a fire.
Thirsty guy: "Dude. My mouth is so dry. I would pay such large amounts of money for a delicious bevarage right now."
Friend: "Have a CMK, bro. Cotton Mouth Killer will quench your thirst."
When your body may be a virgin but your mouth physically and/or verbally isn't.
"I'm just like Jesus." No, you can't be because you're a Mouth Slut.
covering mouth/ mouth covering means you get NO HOES like bro your so LONLEY
look they covering their mouth in photos I knew this Mf gets no hoes mouth covering