Greenlighting is when a male or female (often bisexual) will wear a green shirt, either polo or otherwise, and "pop" or pull their collar up. This marks them as being ready for sex with anyone who chooses them, be it male or female, they are "collared" when someone approaches them and pulls their collar down. This leads to sexual intercourse in most cases or sodomy when both partners are male. The trend is thought to have started in the gay community but quickly spread throught out 2004, with more communities meeting up in real life, and sharing stories online, the term can also be found online on the "Urban Dictionary". Many women who "collar" males see it as a chance for no strings attached sex whilst guys enjoy it for obvious reasons, in gay circles it is seen as a way of openly showing your true feelings. green Lighting shows that you are open to anything and many worry that this may lead to horrific abuse, and whilst this has yet to occur it may only be a matter of time.
when a male of female pops their collar up on a green shirt, it means they want sex. when someone pulls it down, they get it.
by David Dinko Jones July 3, 2005
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A practice where a bisexual wears a green shirt with collar. The collar is worn up, indicating a desire to have sex with anyone. The offer is accepted by the person turning the wearers collar down.
"Why's that girl wearing the green shirt with the collar up?"

"She's greenlighting fool... turn her collar down and get some!"
by cain614 July 6, 2005
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Through active or passive approval, a partner indicates that further advances toward anal intercourse will not be met with resistance. Active greenlight may come in the form of a verbal agreement that anal sex will ensue such as a vocalized "yes" or, in the case that the receiving party is mute, a nodding of the head. Passive greenlight is more commonly observed and relies of the absence of resistance to anal overtures rather than affirmative verbal confirmation.
After successfully placing two fingers in her anus, Robert knew he had the anal greenlight when Lacey did not protest.
by MasterBlaster666 April 4, 2020
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It's a variant of the Chinese Stoplight, known by some as the Chinese Firedrill. The difference however is the car does not stop. It takes a whole new level of badassery to accomplish such a task and it should not be attempted by anyone but the most experienced daredevils.

One good strategy for a 3 person Chinese Greenlight is shown below.
Driver: CHINESE GREENLIGHT GO! *climbs out window onto hood*
Passenger 1: You take the wheel! Meet you on the otherside! *climbs out window onto roof*
Passenger 2: *gives wheel to passenger 1, climbs out window into nearby window*
Driver: *Climbs into passenger 1's original seat.*

All: YEA!! We all just gained a badass level!
by Omega, Quail, Fox. January 21, 2010
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When your partner doesn't care if you have sex with other people.
Mary gave Eric the fuckall greenlight, so now he's screwing Louise
by Mr. T January 27, 2005
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man u wanna play a game of ball? man i was born on a greenlight
by kris d September 1, 2006
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