Green FN is a Gen Z Slang term which most people think it means "Green Fortnite" which is not true.
The term green comes from Hit game "NBA 2K". Green symbolising "Good Basketball Shot".
"FN" is in abbreviation for "Fuck Nigga".
This term is used either in NBA 2K when somebody has a good shot, or when somebody has good rizz. (charisma).
a word that goes back to NBA 2k whenever you scored you'd get a green flag, and alot of people who play basketball are darkskin, AKA a stereotype. fn means f*ck n**ga, obviously the N word is reffered as to black people, whenever a bastket ball player or anyone scores a goal into something, you yell "green fn!" green means you made it, reffering to the green flag in NBA 2K, then fn.
Jason : -Scores a goal in basketball-
Bobby : "Green fn!"
Jason : "Bro your white"
I shall undoubtedly make this shot into the basket
*Goes in* ME: Green FN Some Middle Schooler: Green Fortnite!!1111!!!!
Me: takes out my gun "IT IS FUCKING GREEN FUCK NIGGA NOT FORTNITE LIL NI