Someone who no longer wears a mask indoors for large gatherings. These people are not anti-maskers/anti-vaxxers and used to wear their masks. Due to unclear expectations set by the CDC, state governments, businesses, and peers, they no longer wear their mask.
I was going to go to a wedding this weekend, but I'm sure there will be a lot of Mouth-breathers at the event.
by wells33abducted December 16, 2021

A person who is beautiful, but who always says something stupid/crazy/annoying. He/she is called such, because, much like 911, when he/she opens his/her mouth, the whole world changes.
by apoxy September 30, 2012

Bad breath resulting from sitting in front of one's computer too long. It is very similar to morning breath.
Husband return home from work and leans in to kiss his wife. "What a long day. I sat at my computer and didn't move for 8 hours," he says. Wife replies, "WOW! you're not kidding, you've got a serious case of computer mouth. You should go brush your teeth before you think about kissing me."
by Matthew Michael Wesley October 17, 2008

by vAnlifemethsmokinghooker April 27, 2024

by 4t53w4t3tg35ryg35ryg May 17, 2023

by SteveStevenson February 4, 2023

Person 1: My boyfriend is going to kick your ass.
Person 2: Damn girl, shut your Daelynn Mouth before someone kicks your ass
Person 2: Damn girl, shut your Daelynn Mouth before someone kicks your ass
by JordfromeB April 4, 2022
