What does DUK stand for?

Didn’t you know?

When someone uses the term “DUK”, they are expressing surprise that you didn’t already know something. Let’s say your buddy, Alex, texts you in shock about your common friend, Lisa, being engaged. You might respond with “DUK?” to show that you already knew about it.

“DUK” is part of a bigger group of shortcuts used to quickly communicate understanding or misunderstanding. Some similar terms include DYK, IDK, JSYK, and JTLYK.

However, remember that not everyone is familiar with “DUK”. You might end up confusing people who aren’t up-to-date with the latest slang. They might even think you made a typo and meant to type “duck.”

Example for using ‘DUK’ in a conversation

Hey, did you know that Emily got promoted at work?

DUK? No way! That’s amazing! I had no idea.

Yeah, she’s been working really hard. I’m so proud of her!

Wow, I’m surprised I didn’t know. Thanks for telling me!