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 25, 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 1, 2008
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When a cop gives you a friendly reminded to watch your speed when you aren’t going fast enough for him to actually stop you. He does this by turning on his blue lights for a couple seconds.
I was doing 63 in a 55 and the officer blue-lighted me as I approached.
by automatics64 January 30, 2018
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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 23, 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 25, 2004
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A slogan used by hate group Autism Speaks to promote finding a cure for autism. As a result its better to go REDInstead.
Person 1: Let's light it up blue for Autism!
Person 2: No you asshole! Let's go REDInstead
by YeetleSkeeetles April 13, 2019
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Place in Baltimore City where blue police lights cover the top of street lights in order to monitor crime and violence.
you can tell your almost to penn station when you see all the blue light from the penn line, thats the blue light district
by baltimore love thing April 17, 2011
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