Definition of I or he, she, etc. wasn't born yesterday in English:
Used to indicate that one (or another person) is not foolish or gullible.
- I've heard a few things about these things; I wasn't born yesterday, you know.
- Mel, I wasn't born yesterday; now go get ready before I change my mind.
- I understand second guessing, I will do it at times also, but let's use this to remember that Walt wasn't born yesterday.
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