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

It means the speaker acted out of character and cannot explain it well.
From I'M Obsessed With My Boss Part I, Episode 32
She excuses her behavior by saying she does not know why she acted that way.
Use this when apologizing or trying to explain a strange or impulsive action. It sounds personal and emotional, not formal.
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