A person who is rusty and out of practice. Analogous to rookie, a person who lacks experience in the first place.
Rob: That was a rookie mistake.
Laura: How can that be? He used to be a pro.
Rob: My bad. That was a rustie mistake...
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A shoulder-length haircut (or bob) that makes the recipient look "as cute as a button."
Did you see Laura's new haircut? Isn't she as cute as a button?
Of course, she got a button haircut.