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John's tongue is full of sweet talking and poison.

Is the above sentence correct?

Thank you
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It's grammatically correct. However, I would write
John's mouth is full of sweet talk and poison.
or any of a number of different sentences with similar meaning.
John is all sweet talk and venom.
John is a venomous sweet talker.


CJ
Comments  
sounded ok to me.
 CalifJim's reply was promoted to an answer.