The exact same slang meaning as hit, as in, put a hit on. Used in '80s South-Central gang culture.
Yo man, I heard the Eight Trays put a blue light on Taco 'cause he be dissin their hood in the pen like they ain't gon' hear it.
by Steelo J. February 14, 2005
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An emergency light used by volunteer firefighters, emergency medical personel, and other first responders. Used in/on the responder's personal vehicle to move traffic out of thier way in order to get to the firehouse, emergency scene, etc. In some states blue is a color reserved for law enforcement so volunteers instead use red lights.
Inclues rotating lights, flashing lights, strobes, and most recently LEDs.
by Brad January 24, 2005
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1 The future in automobile luxury. The blue light (also known as the poopy light) must be turned on prior to dropping a duece while driving. Certain European-made cars have the option of the built in toilet seat which flushes the feces through a hole in the underside of the car. In order to give other cars a chance to get out of the way, the blue light must be turned on 3 seconds before releasing said poopy from the car.

2 When the member of a running group announces to the group that he has to fart he can do so by informing them that his blue light is flashing.
1 Thank God that Ravi put the poopy light on, I just had the car washed.

2 "Look out back thurr, my blue light is flashing."
by the_guy January 22, 2005
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The light in which will never go on and is just there to make u paranoid. Drop ya beers when it lights up or ur fucked or... grab another beer and do the god dance, the good way to go down.
by TRACYZ February 24, 2004
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Cop lights; party lights.
Pull over and stop.
Do it now!
DRIVER TARGETED FOR TRAFFIC STOP: "BLUE LIGHTS in my rearview dammit!"
COP ASSUMES DRIVER SAYS: "Here baby, hide this niggerpipe in your bra."
COP: "Driver! Turn off the engine and throw the keys out the driver's side window! Do it NOW!
Step out with your hands on your head!
Driver! Walk backwards toward my voice!
Don't look at me!
Stop! Lay face down with your hands to your side!"

"The frightening arrest scenarios depicted on the 'reality' TV show Cops have elevated BLUE LIGHTS to terrorism status as the brainwashing of America continues on network TV."
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n. To be seen by the police, called this because the cops light is usually blue.
"Oh shit nigga, hurry up and swallow that weed cause we done been blue lighted!!!"
by Pimp Master J April 20, 2005
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Term used in an office when a group of fellow employees want to drink together during office hours.
“Hey! Why don't we all go into TJ’s office and turn on the blue light?!?”
by Blenk May 01, 2008
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