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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Person 1: When will we pour chocolate syrup on each other?
Person 2: IDN
by Shay Shay July 7, 2003
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Idne is a person who is obsessed with TikTok and has more clout than most people at their school. They are weird but cool at the same time. They are the kind of person you would want to be friends with.
Person from Idne’s School: Hey Idne, can I have a shoutout on TikTok?

Idne: Nah, I’m not a huge fan of giving shoutouts, but maybe another day
by Hi Sisters😂... June 1, 2020
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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 April 30, 2018
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i drive now....................
idn cuz i jus got my permit.
by Katti July 17, 2006
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