Top Definition
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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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

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt