Top Definition
another synonym for a person's brain
use your thinking cap first, before doing something retargerous
by sexydimma May 04, 2015
When your dumb ass is so dumb that you need to wear a helmet when doing normal activities such as riding the short bus or sleeping. Also, randomly dropping face first out of nowhere may be a side effect.
Dave's dumb ass fell straight out of his chair the other night and ate carpet, luckily he was wearing his thinking-cap.
by Sloth Fucker October 07, 2013
Time to put on my thinking cap.
by RichardInTheBox January 15, 2012

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