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may i know the meanings?

i found in one of the dictionary that it is like someone talking unwisely. is it right?

However, in one of the dictionary it says that:


Lying for effect; Letting your mouth write checks that your ass can't cash.


I dont understand. can anybody tell?
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The usual expression is 'You're talking out the back of your head', meaning 'You're talking nonsense'.

Rover
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Hi,

Talking out the side of your neck


Letting your mouth write checks that your ass can't cash.

I've never heard either of these expressions.

Clive
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Comments  
Cahaya KebahagiaanLetting your mouth write checks that your ass can't cash.
This means that you are making promises or threats that you are not able to carry through with.
tq very much
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 Clive's reply was promoted to an answer.
Rover_KEThe usual expression is 'You're talking out the back of your head', meaning 'You're talking nonsense'.
Interesting. This isn't usual for me. Where I grew up the expression was 'You're talking through your hat'. I have no idea of the origin, but I suspect it may be a 'politically incorrect' reference to Mormonism.

CJ
It means talking about something you don't know anything about, fabricating things, gossiping
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