screwy

I get it when 'screw' is applied to face-making, but why is 'screwing UP' making a mistake? Upwards screwing seems better than upwards nailing, for anything you'd want supported by something thusly fastened - unless this slang derived from the other slang for screwing as in the making of the sexytime, but if screwing UP is a mistake in that context, then it seems like some awfully unimaginative screwing.