English phrase from drama scenes

What Does "i don't know what i was thinking" Mean?

Learn what "i don't know what i was thinking" means, when people say it, and how to use it naturally in English.

Beginner
Neutral
Soft
Apologize

I don't know what I was thinking.

It means I made a foolish choice and now regret it.

From The Chauffeur, Episode 22

When do people say this?

Scene Context

Someone is admitting they made a bad decision and do not understand why.

Usage Scenario

Use this when apologizing or explaining a mistake. It sounds natural and very common in spoken English.

Better ways to say it

1
What was I thinking?
2
I wasn't thinking.
3
I have no idea what I was thinking.

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How to Apologize in English

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