Meaning I don't know
Type Acronym
Popularity ★ ★ ★ ★ ★  Popular
Usage Online Only (chat, messaging, e-mail)

IDK is a popular acronym used to say "I don't know." It is often used as a one word response to a question that you have no answer to.

The acronym can be seen almost anywhere online but is most frequently used in online chat and in text messaging. It may also be used by teenagers when they don't want to put forth any effort to communicate or explain how they are feeling.

Example "IDK, my BFF Jill?"
Updated March 21, 2019
Information from PC.net