The phrase “this completely flew under my radar” simply means you didn’t notice or hear about something earlier, and now you’ve suddenly discovered it.
People often say it when:
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A useful tip or trick they didn’t know before suddenly appears.
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News or information they somehow missed until now.
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A trend that was happening but they weren’t aware of.
Example:
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“The dishwasher pod cleaning trick totally flew under my radar.”
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“That health tip flew under my radar until someone told me.”
So it’s basically a casual way of saying:
👉 “I can’t believe I didn’t know about this before.”
If you want, I can also show you 10 everyday phrases like this that native English speakers use all the time—they’re fun and very useful in conversation. 😊