Spidey sense
Derived from the "Spidey sense" of the comic book superhero Spiderman, it is generally used to mean a vague but strong sense of something being wrong, dangerous, suspicious, a security situation.
He looked like a student, but something about his dirty shoes and the way he tried to open a locked door totally set off my Spidey sense, so I called campus security.
Spidey sense by JohnnyHoffa March 23, 2008
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