Learn what "you have no idea who you're dealing with" means, when people say it, and how to use it naturally in English.

It means the speaker is warning the other person not to underestimate them.
From Undercovered Heart, Episode 60
The speaker warns someone that they are underestimating who they are dealing with.
Use it in a heated argument or confrontation, but it sounds threatening and aggressive. It is not polite and can sound very hostile at work or with strangers.
Scenes unlock real expressions as you watch
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