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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 11, 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 24, 2011
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