One who goes on and on talking about a topic or insisting something despite the reluctant listener. This term can be loosely used for many varying usages.
Example A: Spok, I've heard about your new car a thousand times. Stop digging my brain.
Example B: Uhura doesn't stop nagging me to go to the doctor, what a brain digger.
Example C: I was at Chekov's party yesterday, and there was this brain digger there that didn't stop talking to me. Eventually I just left.
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