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1.
An adjective characterizing someone who consistently drops the ball; always fails to do something or deliver; is generally useless
Oh man, Tyrus forgot to pick up the tickets yesterday? What a dith.

It's been three weeks and he still hasn't delivered the project, this guy is a total dith.
by streetsofSF49 October 10, 2011
 
2.
Someone who looks or acts like a Deer in the Headlights.
He was so unaware of the conversation that he came off looking like a dith.
by DrG February 10, 2012
 
3.
acronym for resting ones penis in the quaff of another, often unsuspecting, subject. Or Dick In The Hair
The longest dith I have ever gotten away with was 5 minutes at my brothers barmitzva
by Anonymous April 19, 2003