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slang An initialism of "I don't know." Used primarily in online or SMS communications. Often spelled in lowercase letters. A: "what time R U coming home?" B: "idk, maybe 5?" A: "How do you suggest we fix it?" B: "IDK what it would look like, just something that's more fair to everyone!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.