A backseat DUI occurres when a sober person is driving an
intoxicated person home, and the
intoxicated individual is giving the driver shitty directions, and false
instructions to turn, and then saying "No, No, not this street..."
This causes the driver to speed up, slow down, and begin to turn, then swerve back into the driving lane, leading others observing the vehicle from the outside to believe that the driver is DUI.
"I was driving Marcus home
the other night from the local
water hole and he kept telling me to turn and shit and I was
all over the place and then I got pulled over, but it was cool, the cop realized Marcus was just backseat DUI."