What does IDK mean?
I don't know
Other definitions of IDK:
- I don't know
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How to use the term IDK:
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More slang terms:

D2U
Direct to You

Sapiosexual
A term for people who are primarily attracted to intelligence, often finding it arousing.

GG
An acronym for "Good Game" — said at the end of a match, though it can be said prematurely as a taunt.

IKY
I Know You