"Hot Mess"

Is there a name for that particular activity of the brain when one only actually reads or sees part of a word, and with no regard to sense or context, the brain thinks it has seen the rest of word?
I just did it at the MusicaSacra forum, where I should have known no one would have a blog called "Clams for Desert."

And several times recently, I thought Longchamps was being bracingly honest, since it had indeed hired a hot mess for its ad campaign: