• It came from the carpenters back when. You carry the nails that you are to use immediately, in your mouth to reach them easily. If you were "so mad that you could spit nails", would mean you would have to deal with the problem at hand, and couldn't talk when you have a mouth full of nails, so you would have to spit them out to yell at someone... then climb down the ladder and get more nails, which is a pain in the butt.

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