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1. the kind of person that talks crap and may have pathetic comebacks

2. someone who spreads rumors, even if they aren't true

3. that one person you can't tell your secrets to
Boy: You're a freak and you're ugly.

Girl: Kid, you need to back off and leave me the hell alone before I freaking punch you in your big, fat mouth.
fat mouth by BatmansGotSwag October 18, 2011
someone who runs their mouth and talks all the time.
you wouldnt want to tell them anything, because they are likely to tell the world.

watch your back around a fat mouth.
People named RJ tend to be a liar and a fat mouth.
fat mouth by Jaeeeeeeeeeeeeyy October 13, 2010

shut your fat mouth 

You have a lot to say that no one wants to hear in other words there are so many words in your mouth waiting to come out its "FAT".
I am tired of hearing your shit so do me a favor and shut your fat mouth!
shut your fat mouth by SLAYER%% November 9, 2014

fat ass mouth

You, a bitch ass recruit, has made the mistake of whispering to a drill instructor instead of ripping your throat apart trying to scream
*insert command* “aye aye sir” ok open your fat ass mouth “AYE AYE SIR”
fat ass mouth by A-way J August 16, 2022

Fat juicy cock in my mouth 

“hey”
“don’t even talk to me all i want is some ‘fat juicy cock in my mouthright now
“same bro, same...”

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