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A psuedo-scientific measure of the maximum capacity of a room for retardation/retarded behavior.
Using a soldering iron to fix a broken support beam in a futon almost breaches the retardacity limit in a given room.

"This room has reached its retardacity limit. If it gets any more retarded something will probably catch on fire."
by HugoBoom May 06, 2006
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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2
Being so blatantly ignorant and stupid, you shock and offend the public.
The shear retardacity of Sarah Palin, to say those things on television, it hurts me.
by Slackkidlb7 June 15, 2011
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3
A person who is openly stupid regardless of consequences.
He knew that it was shark infested waters but he had the retardacity to get in and swim anyways.
by Zer0left April 05, 2017
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