Red-lighting/to red-light is to draw unwanted attention to yourself or another person, usually when committing a criminal act or trying to get away with something shady.

You risk red-lighting yourself &/or another person by behaving in a manner that may elicit unwanted scrutiny.

In Australia the saying is usually used by those who have a criminal background and tends to be associated with people from that demographic.

Sitting in a car for an extended period of time when waiting to score.
Being under the influence when dealing with authority figures.

Engaging in avoidable, often pointless activities that put a person at risk of discovery when they would otherwise be in a position to evade notice such as;
driving a few km over the speed limit, using your mobile while driving, stealing something trivial, engaging in unnecessary conflict (verbal or otherwise), littering and so on.
"Mate, I ended up red-lighting myself something bad waiting for Jimbo to show."

"You're just going to red-light yourself driving to Springvale in that car."
by Slim Crim January 12, 2019
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The act of hallucinating without the use of psychoactive drugs, such as LSD or acid. This requires one ping pong ball, a radio with headphone jack, and a red lightbulb. To hallucinate, cut the ping pong ball in half and tape halves over eyes. Then turn the radio to a white noise (static) station and put on headphones. Finally, stare into red lightbulb and wait for about half an hour. Soon, you will start to hallucinate.
Greg: Where were you man? We we're gonna watch the game!

Ben: I was at home, red-lighting. I rode a unicorn underwater.

Greg: That explains why you didn't text back.
by rugger26 April 25, 2011
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The moment just prior to having uncontrollable diarrhoea. A red light gives you approximately 10 seconds to make it to the bathroom before wherever you are becomes ground zero for a "pooclear" explosion.
I was on the train to work this morning when without warning I got a red light and some fucker was in the bathroom! I had no choice but to go in the sink!
by braceyajax April 23, 2010
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A game played by two people where player 1 puts their hand up player 2's pants, if player 2 gets uncomfortable they say "red light," this means player 1 wins. If player 1 gets uncomfortable and takes their hand out of player 2's pants, player 2 wins. If player 1 touches player 2's genitals, it is considered a draw.
Player 1: Want to play 'Red Light'
Player 2: sure!
(Player 1 slowly moves their hand up player 2's pants until they are just about to touch their scrotum)
Player 2: RED LIGHT!!!
(Even though player 1 has won they continue and end up giving player 2 a handjob)
by Porn54 March 17, 2017
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“I changed my LED lights to red lights because it’s so fitting for when I’m horny
by 333stone October 5, 2020
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A way of telling someone to be quiet, or shut up. Or it can be used a way to interrupt.
*Girl Talking Shit*
Girl 1 - OMG. She's such a slut, like I would kick her ass.
Girl 2 - I'm going to have to red light you real quick. Stop talking shit.

*Two males in fight*
Guy - Is it a scrap? Like what's good? Nize it.
Guy 2 - Nize it? RED LIGHT, RED LIGHT. Come at me then.
by IgnoranceIsBlissTHO February 23, 2012
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