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big mouth 

used in reference to somebody who likes to spread gossip, or who cannot keep a secret
His ex-girlfriend told everyone that he had a small penis. When he found out, he just said that she had a big mouth.
big mouth by yorrick hunt January 23, 2008

big mouth 

When a person talk too much, they have a big mouth.
That little boy has a big mouth.
big mouth by kame63 July 1, 2011

big mouthed

Based on the Netflix show 'Big Mouth' one of the characters masterbates whilst on a sleep over at his friend's house. To big mouth someone is to masterbate at at a sleep over when others sleep.
Finn: "I know you big mouthed me last night..."
Daniel:"Omg! I thought you were asleep I'm so sorry... I was just so horny."
big mouthed by ScruffyNuffy July 2, 2018

Big mouth vagina 

A vagina thats been fuck so hard over and over again that its like throwing a hot dog down a hallway.
I was about to totally fuck this chick's brains out, but then i saw her big mouth vagina and was like fuck that.

Big Mouth Nigger 

When a person of color has a bad opinion or acts cocky.
Stupid Nigger: Yo the remix is always better than the original.
Intellectual: Stop being a big mouth nigger.
Big Mouth Nigger by Buzzy Boi December 25, 2018

AIM big mouth 

Someone who, while on AIM, constantly copies parts of their IMs with certain people and pastes them to others. Like in real life, the big mouth will rat people out when they talk about someone else, only this time it's online rather than through spoken words.
My brother is the biggest AIM big mouth in the world. Every time I talk about someone, he has to copy and paste that excerpt of our conversation and send it to them. One day, he will pay for this.
AIM big mouth by Devveyovich October 25, 2008