iykyk

What it means

Stands for 'if you know, you know' — tagged onto something that only makes sense to people with the right inside knowledge or shared experience. It signals an inside joke or a niche reference without explaining it.

Examples

• Posted a photo of the old gym with just 'iykyk.'
• If you went to that summer camp, iykyk.
• The ending hit different the second time. Iykyk.
• Dropped the reference in the caption — iykyk.

Where it comes from

An acronym of the phrase 'if you know, you know,' which circulated for years before becoming a popular hashtag on Instagram and TikTok in the early 2020s for inside-joke and nostalgia posts.

Related slang