What is Fatmouth?
1.
Used to describe someone who cannot shut up, talks with verbal diahorrea or who swears a lot- almost used in that case interchangeably with 'foulmouth'.
She's such an anonying little fatmouth.
Shut up you fatmouth little bitch!
See
2.
A famous serial rapist, that emerged in the 21st century.
"oops i dropped my wallet"
*enter fatmouth*
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