Top Definition
To rev an engine out past the reading capabilities of it's tachometer. This often happens in built 4 cylinder engines that have been designed to rev past normal engine limits, sometimes past 11,000 RPMs. This problem is often resolved by putting a monster 5" tach on the dash. Installing this equipment is also common among ricers who want their car to seem fast.
Damn son!!! I dropped a new built b18 in my EG hatch and I tach out everytime I hit the gas!!! Honda power!!!
by Da C-Rob February 13, 2010

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