Top Definition
If you didn't know, or In case you didn't know
George Bush's birthday is July 6th, IYDK.
by Leo_Arthur December 19, 2006
1 more definition
Stands for "Incase you didn't know".
To imply something useless/things that doesn't concern anybody.
Guy #1 - iydk I just came to midget porn.
Guy #2 - Thanks for letting me know,concerns me alot.(sarcasm)
by HazePoniPoni February 18, 2015

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