Learn what "what the hell were you thinking" means, when people say it, and how to use it naturally in English.

It is a strong way to ask someone why they acted so stupidly or irresponsibly.
From Married To A Stranger, Episode 54
The speaker angrily questions what the other person was thinking.
Use this in angry arguments or when reacting to a bad decision. It sounds rude and confrontational, so it is not for polite settings.
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