Nerven are nerves, and a Säge is a saw. Taken together, they refer to somebody or something that gets on your nerve, badly and persistently. A Nervensäge can be strictly a creature of the imagination, like Frosty, the Snowman, or Rudolph, the red-nosed reindeer, or something that exists in real life, like a child who's endlessly complaining or a sports commentator who is more in love with the sound of his voice than the game he is supposed to comment on.
BTW The kind of handsaw that was the inspiration for my rendering of a Nervensäge is called a Fuchsschwanz (fox tail) in German.
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