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.