A Green Flag is the direct opposite of a Red Flag. You know those things we know at the start of a relationship we avoid. Typically Red Flags are not as desirable as Green Flags considering Green Flags are often mature, responsible, honest, virtuous, and socially acceptable. But Green Flags are often not as desirable as Red Flags because they have nothing to fix. People prize generally fucked up people who have mommy and or daddy issues, usually a drug problem, unemployed, or typically someone you wouldn't want to bring home or have a child with.
"Wow, what a catch! he's got a career and his own home. What? He also has a relationship with his family and can keep plants alive. Those are all Green flags. You should let him knock you up."

"Ok, so tell me about her?"
"Well, for starters she doesn't have an Onlyfans."
"Well that's a Green Flag if I've ever seen one."
by theoriginalpizzakitten February 21, 2021
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When Group A has prior knowledge of and does not prevent an attack by Group B, often having beneficial results for Group A or both parties

Different from a false flag in that Group A did not engineer the attack, but rather, having received foreknowledge of an attack by Group B, allowed it to proceed. This results in any number of benefits for Group A or both parties (i.e. economic boost, useful victimhood on the world stage, demographic changes).
"The US received word beforehand that the Japanese were planning an attack on Pearl Harbor! Why did they do nothing to stop it?"

"The elite wanted a boost to our economy, and they knew joining WWII was just the ticket. A total green flag."
by StrokeOfGeenius October 15, 2023
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green flag = good trait(s)
The fact that she genuinely cares about people is one of her "green flags".
by b1+ch February 8, 2022
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object of green color used in the flagging business for the symbolization of a drug dealer. With the flag on means he/she has drugs availible for sale. Usually a bandana.
That boy has his green flag on today.
by iknowwuthappens November 13, 2006
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A representation of 4k tray which is a gang created by nba youngboy
total green flag shit like 4K tray
by Brandon Dayton April 30, 2019
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A single person; On the dating market.
Tova: That guy is really hot.
Eliana: I believe he's green flagged.
Tova: Nice!
by Brown Eyed Girl May 30, 2005
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a.k.a Lee Jun-ho from Extraordinary Attorney Woo
Waaaah! He's a Lee Jun-ho, a walking green flag!
by kwint2543 August 3, 2022
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