Meaning
Two-faced and deceitful — a person who says one thing to your face and another behind your back, or who cannot be trusted to keep their word. To have 'two mout' is to speak with two mouths, telling different stories to different people to suit the moment, and the word is a sharp condemnation of the false, double-dealing tongue. In a culture that prizes a person's word and distrusts the news-carrier and the deceiver, to be called 'two mout' is a real reproach, marking someone as slippery and not to be believed.
Examples
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Nuh trust har, she too two mout.
Don't trust her, she's too two-faced.
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Him a two mout man, seh one ting an do anodda.
He's a two-faced man, says one thing and does another.
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Two mout people cyaa keep no friend.
Two-faced people can't keep any friends.
Origin
From the image of a person with 'two mouths' — speaking two contradictory ways, hence duplicitous.
How it’s used
A sharp criticism of duplicity and untrustworthiness.