What is Boston Left?
1.
A left hand turn that is started far too early and made at approximately 45 degrees instead of 90 degrees. Used primarily when trying to make a turn ahead of an oncoming car, often to cut in front of a long line of oncoming cars.
That dude in the Monte Carlo just banged a harsh Boston Left
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2.
Taking a left hand turn from the center lane (or lane to the right of the left turn lane) so as to avoid the traffic in the turning lane.
"The line to take a left sucked, so i said fuck it and took a boston left.
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