Gen Alpha slang · Abbreviation
iykyk
Meaning
Iykyk is Gen Alpha slang for "if you know, you know" — a nod to an inside joke.
Where it came from
Dictionary.com finds it on social media since at least 2009, with use growing in the mid-2010s.
Tone check
Harmless, though it sometimes points at a joke adults are not meant to get.
Checked against: Dictionary.com, IYKYK.
Added to this dictionary 2 November 2026
Used in a sentence
"that bus ride iykyk"
Peak: 2009–2026
Safe for adults to use
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