Does anyone know what is the origin of the phrase "Dead on Balls Accurate" ?

Thanks,
- N

The phrase is from the movie "My Cousin Vinny."

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Originally Posted by walt17

The phrase is from the movie "My Cousin Vinny."

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Before the movie, wasn't the phrase used frequently in the automotive industry?

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Originally Posted by ngasnier

Before the movie, wasn't the phrase used frequently in the automotive industry?

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Perhaps. The movie is the first time I heard it. If it really is an automotive term, it will probably require an old (mature) mechanic to vouch for it.

Urban Dictionary: dead-on-balls

Dead-on-balls :
Something very well put, right on target

Mudville Gazette
Vinny: In that case, how can you be sure THAT'S accurate?
Mona Lisa: Because a split second before the torque wrench was applied to the faucet handle, it had been calibrated by top members of the state and federal department of weights and measures, to be dead on balls accurate. Here's the certificate of validation!
Vinny: Dead on balls accurate?
Mona Lisa: It's an industry term.
Vinny: I guess the... thing is broken!

Mona Lisa: I've shortened "dead on balls accurate" to 'DOBA', and use it to describe any situation where someone is exactly right, certified as calibrated by top members of the state and federal department of weights and measures.