ITYK
ITYK definition by Slang.net
This page explains what the acronym "ITYK" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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In chat and text messages, ITYK typically stands for "I thought you knew." Your friends and family may use this acronym to express their surprise, when they realize you did not know about a significant event or piece of information.
In some cases, however, people may instead use ITYK to stand for "I think you know." This version of ITYK is used to imply that, whatever question you just asked, you likely already know the answer.