Learn what "you don't know who you're messing with" means, when people say it, and how to use it naturally in English.

This is a warning meaning the other person does not understand how serious or powerful the speaker is.
From Trial Marriage To A Billionaire Season 2, Episode 8
Someone warns another person that they are underestimating who they are dealing with.
Use it in a fight or threatening comeback. It is aggressive and can sound intimidating or hostile.
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