a callus caused by a 2nd degree burn, usually caused by touching an extremely hot surface. For example, touching the engine block of a motorcycle while using a mini kryptonite and a kryptonite cable lock to secure said motorcycle against all but the most determined liberators.

I looked at it, thought that's gonna hurt, and proceeded to spend the next four hours pointing at icecubes. (With minor painful interruptions to do a bit of mig welding for myself and others)

Happy coincidence is that the callus is most useful for mousing with a trackpad.

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