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1.
Something that has happened or someone that seems to have the stupidity equal to half of a retard's intellect.
"This homework is half retarded"
or
"You're half retarded"
by I eatz teh babehs October 05, 2008
 
2.
Some one Who is not fully retarded so you have some part of your brain where your retarded but not retarded in another.
My mom dropped me on my head sideways now I'm half-retarded.
by Hiyo802 December 24, 2009