Abbreviation for "injecting drug user," any drug user that injects their drugs intravenously with a needle.
IDU's should never share needles.
by avergonzado August 09, 2010
Top Definition
I don't understand
u know, idu thaat dysfunctional family
by kk October 15, 2003
A short way of saying 'I don't understand' it was first founded by. Josh A Daniell
Do you know if she'll go to the mall tonite?

by Josh A Daniell March 30, 2015
abbreviation for "i don't remember"
Kamikaze Honeydew: HAOUfherogu 038 aytvdbo35
Kamikaze Watermelon: idu
by Kamikaze Watermelon February 24, 2009

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