Top Definition
Internet lingo and abbreviation for "do you not understand?" Most likely to be used in text messages that excessively uses internet abbreviations at the expense of clarity. Dunu is believed to have originated in Santa Monica, California at Zag, Inc. by a certain area sales manager.
Les: Hey Larry, sometimes I see you note in SalesForce the abbreviation “Im.” Just curious, what does it mean?
Larry: Omg, wth, dunu……lm is left message…thought you were all "texty."
Les: stfu.

by Lesifer February 22, 2008
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