Learn what "you can't be serious i don't understand" means, when people say it, and how to use it naturally in English.

It means the speaker is shocked or doubtful and does not believe the situation is real or sensible.
From Two Worlds Apart, Episode 46
The speaker reacts in disbelief and says they do not understand what is happening.
Use this when reacting to something unbelievable in a conversation or argument. It sounds emotional and is better as a useful learner line than a page target.
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