writer's bump

In a rare moment of decadence I decided on a manicure. The lady (for she was, after all, over 60) remarked on my “writer’s bump”. It had me wondering, do young writers today even know what a “writer’s bump” is? I remember being very proud of mine – it said “she’s surgically attached to her pen” and I could recognize other wordsmiths by their calloused middle digits.