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Boston Turn Signal 

A lude gesture involving the extension of the third finger on the left hand out the window of a moving vehicle. While this gesture is most often reserved for the operator of the vehicle, passengers in the front and rear may be recruited as needed. ie. flying the bird as an excuse for driving like a masshole.
Jonny flashed his Boston turn signal as he cut off all the oncoming traffic.

Turn signal 

A mythical object, believed to be found inside automobiles in or around Philadelphia.
If only there was a way to signal this turn so the person behind me knows what my intentions are. Oh well I'm from philly and wouldn't use a turn signal anyway.
Turn signal by Coooolringi March 3, 2014

California Turn Signal 

Flipping the bird, usually to another driver, either upon witnessing an act of pure idiocy or during road rage.
That old fart is doing 20 under the limit in the carpool lane....give 'em the California Turn Signal, will ya?

Illinois Turn Signal 

When a driver from Illinois suddenly veers into your lane for no reason, with no turn signal whatsoever. Usually performed at high speed, and when no other cars are in the vicinity.

The idea to teach the concept of "turn signals" has been floated through years in Illinois driver's ed schools, but nothing serious has come of it.

Outside of Illinois, it is most often seen by Wisconsin and Indiana residents due to the prevalence of FIBs.
Two guys in a car: one from Wisconsin, the other from Illinois.

Wisconsin driver: That asshole just cut me off!
Illinois passenger: Oh come on, he did use the Illinois Turn Signal.
Illinois Turn Signal by TheSchnauf November 14, 2011

turn signal 

the light that indicates which way you are going to turn while driving....a lever to left of the steering wheel is raised or lowered to start the flashing of the light
Most drivers these days are not aware that their cars come equipped with turn signals, or they are just too "busy" to use them- they expect other drivers to be psychic and figure out what exactly they are doing- it is infuriating!!!!!
turn signal by Meadow Soprano December 6, 2005

Maryland turn signal 

When you turn your turn signal on when you are already in the process of changing lanes
In high traffic I use the Maryland turn signal when changing lanes so I don't get blocked out