ILYK definition by Slang.net
This page explains what the acronym "ILYK" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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When someone responds to your message with ILYK (I'll let you know), it means they're going to share some information with you at a later time. (Likely, because the information isn't quite ready to share.)
For example, if you ask your best friend Tyler if he can make it to your birthday party, and Tyler doesn't know his upcoming work schedule, he might respond with ILYK. In this case, you may want to reconsider whether Tyler is really your BFF.