Archaic expression, used in many trades to mean 'spot on', or absolutely accurate. It originates from the times when machinsts machines were set with a set of nuts, on a fine threaded screw inside the machine which controled it's movements to and froe. The nut would be set at absolute zero, or the stop, or limit of the machine. When the nut was tightened, and the zero set, it would be considered a dead nut.
I know that part was accurate, my machine was dead nuts on!
by D. Cypher May 30, 2017
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When you've had so much sex, your balls cannot physically release any more semen until they recover.
Mike Pence had so much gay sex last night with Donald Trump that he had dead nuts.
by BonsaiSteve July 06, 2018
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Machinist/ fabricator/construction term; great precision or accuracy. Perhaps related to dead on.
The location of this anchor bolt is dead nuts.
by nemo storm July 14, 2011
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dead even, right on the money, exactly right, correct,level, plum, even. this list can go on.
Johnny was dead nuts with the other racer.

Johnny as dead nuts with his answer to that question.
by jimmyjoemickeychuck June 21, 2009
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Completely level or plumb. A definition used in the construction trades.
After I laid the porch steps I checked them with my level and they were dead nuts!
by Nate Pesci July 11, 2006
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Very accurate. When used as an explanatory measurement, it means that it is within 99% accuracy.
When I shot that bitch up in the face with my desert eagle, I made sure the slide was dead nuts on.
by Denis Baldwin February 03, 2004
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