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The act of shifting a manual car to their highest gear and leaving it there regardless of how long it takes for the car to accelerate. The only time a bullshifter would shift down would be at the risk of stalling. Bullshifting is primarily a result of laziness.
Passenger: "Shouldn't you shift down? You're going freaking slow."
Driver: "Nah. I'm bullshifting."
by supereboy November 20, 2012