phrase

IYKYK

eye-why-kay-why-kay

IYKYK (phrase) means If you know, you know: used to mark something as an in-joke or shared reference that will land only with people already familiar with it. Example: “Third table from the back, 2019. IYKYK.”

phrase

informal If you know, you know: used to mark something as an in-joke or shared reference that will land only with people already familiar with it.

"Third table from the back, 2019. IYKYK."

How to Use IYKYK

Learner’s notes

In plain EnglishA way of saying "only some people will get this, and that's the point."

When to use it

Informal, almost entirely written rather than spoken.

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Fill the Gap

Can you complete this real example?

Third table from the back, 2019. _____.

Etymology

An initialism of the phrase "if you know, you know," which spread through social media captions and comments in the late 2010s.

Origin: English

Frequently Asked Questions

What does IYKYK mean?

If you know, you know. It signals that a reference is deliberately unexplained — people with the shared context will get it, and that exclusivity is the point.

When do people use IYKYK?

Usually at the end of a post or caption about something niche or nostalgic, as a nod to the small group who will recognise it.