Moat likely, the reference is to the Showtime series named Dexter who was a serial killer who only killed bad guys. It might refer to the cartoon Dexter’s Laboratory which starred a boy named Dexter.
It means you’re not a Poindexter, an idiot in the field, somebody who can be counted on and relied on, someone who’s not a bean counter or pencil Pusher who just happens to be wearing military bdu’s.
It means that your name isn’t Dexter.
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