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An initialism of "do/did you know," used especially in text messaging or in online communications, such as forums, chat rooms, instant messaging, etc. A: "DYK why the boss is so upset?" B: "No idea." A: "DYK that the tallest mountain on Earth, from base to summit, is Mauna Kea in Hawaii?" B: "Wow!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.