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The false perception that a hat is still on your head even though it was recently removed. Typically occurs after having hat in place for extended periods of several hours or more. The perception is often strong enough that you may reach to remove or adjust the hat even though it is no longer there.
At dinner, after the game, the starting pitcher experienced repeated moments of hatsation as he reached for a baseball cap that was not there.
Hatsation by Barnguy November 18, 2012
Related Words

Hatiator 

A radiator you hate because it makes an annoying whirring sound.
This hatiator needs to shut up.
Hatiator by Ereck Flowers June 24, 2016