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1.
The habit of being alert to another's intentions to fool or deceive yourself or others.

A natural tendency to doubt the actions or intentions of others.

An innate ability to spot treachery and deception before it negatively affects oneself.
He says he isn't isn't trying to move in on my girl but my hocus focus tells me otherwise.

"Dude, you never would have been fooled into buying that piece of junk if you had some hocus focus."
by Sweet n' Low November 18, 2011