Much like the word shrew, but taken much further. This term is actually for men (rather than women) with a violent, scolding, or nagging temperament. The term also involves arse-kissing and memory loss. Shrewdies are often seen with brief cases and bluetooths to make them feel like they're important but... not so much.
Uh oh... Since that new position was created for John, I sure hope he doesn't pull a shrewdy! He's too nice of a guy to cross over to the dark side!!