Learn what "you can't be a bug" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the claim is impossible or absurd.
From Rosy Psycho, Episode 35
Someone rejects the idea that the other person could be an insect.
Use this to reject an unbelievable idea. Taken literally, the line is unusual, so it may sound odd outside the story.
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