What is if you know you know?

"If you know, you know" (often abbreviated as IYKYK) is a phrase commonly used to express an understanding or knowledge that only certain people with specific experiences or insider information share. It implies that the information or context is exclusive or niche, and those who are unaware might not fully grasp its significance or meaning.

The phrase gained popularity through internet culture and is frequently used in memes, social media posts, and conversations to create a sense of community or shared understanding among those "in the know." It highlights the idea that some experiences or knowledge are not easily explained and can only be truly understood by those who have lived them.