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Even dumb people have found a way to abbreviate. IDN stands for "I don't no." An educated person says "I don't know," which can be abbreviated to "IDK." If you see someone that types "IDN" on a regular basis, you know that their IQ isn't very high.

NOTE: If said person is dumb enough to use IDN, I doubt they'd take the time to use capitals, making it "idn."

You may also see "IN", or "in," which can translate into the opposite: "I know," or to an educated abbreviator, "ik. "
First dumb person: hey britney do u like jake
Second dumb person: idn i here hes pretty dum
First dumb person: but hes so hott
Second dumb person: ya in lol

Translation:
First smart person: Hey, Britney, do you like Jake?
Second smart person: I don't know, I hear he's pretty dumb.
First smart person: But he's so attractive.

Second smart person: Yeah, I know.
by JacksonCampbell July 18, 2010
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2
Infant Dick Nipple Syndrome - a woman who has bewilderingly lengthy nipples, comparable to that of a male infant's genitalia
"Yo watch out for her, she has IDNS!"
by Loudpack Landry May 31, 2018
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I didn't notice.
Billy: Mate you're not wearing shoes.
Jimmy: Like idn. Urgh
by Nate Everden March 18, 2016
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