fatmouth

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!

by whitecracker556 March 9, 2009

fatmouth

A famous serial rapist, that emerged in the 21st century.

"oops i dropped my wallet"
*enter fatmouth*

by Gritto October 9, 2003

fatmouth

Used to describe someone with a hearty appetite. Can be used as a noun or a verb.

Glen is such a fatmouth, I can't believe he ate that whole party size bag of Doritos in one sitting.

Man, I'm so hungry I could fatmouth a Fuddruckers 1/2lb burger right now.

by Goo L January 8, 2021