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A person who is unusually scruffy, disheveled, disorganized, and clumsy. Can also be used as a term of endearment.
My friend is such a mal doon, he always wears his bobble hats lopsided and never arrives on time.

I love you mal doon
by Faye Wyatt February 27, 2008
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SGTS in the military who think they know it all, or are funny, but in actuality are only compensating for their own " short comings"
E-5 - E-7 mainly males are maldoons, rarely females, but some have known to be
by specialist/e-4 May 14, 2010
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