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Cockmouth 

One experiences cockmouth when they are near or around a guy (or guys) and want to impress them with either their bullshit lies or actual awesome stories. Either way, when you are being a cockmouth, you just sound like a bragging bitch. A tell tale sign that you are suffering from cockmouth is when the people around you cannot stop rolling their eyes.
Julia: Yeah, Brad, I totally bungee jumped off of that bridge in Sydney, right after I explored the reef and fended off a giant sting ray who was trying to mate with my bestie. Did I tell you, I'm a trained animal psychiatrist, oh, and that stingray thing totes made me a local celebrity.

Sarah: (rolls eyes) Wow, Julia just won't shut her big fucking cockmouth.
Cockmouth by lifewithlemons November 15, 2011

Cockmouth 

That dude who sounds like he has a cock in his mouth every time he talks
“Yo, have you heard Don speak? He sounds like a cockmouth”
Cockmouth by BeastAssMother October 18, 2019

Cockmoth 

In the minutes after moulting, a German Cockroach appears white, usually with its wings spread out at an odd angle, resembling a small white moth.
Cockmoth by Vice420 December 5, 2018

cocknmouth 

Someone that is pissy or someone you just don't click with
Bro I'm straight up not having a good time with this cocknmouth around.

Facts hes/she is pissy
cocknmouth by 26953216 July 7, 2021