Abbreviation to: Green Fuck Nigga. Was used in a NBA2K viral meme video which someone says "green fuck nigga" and its now being used as a tiktok slang when someone says something out of pocket or being charismatic with someone.
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Some dude: green fuck nigga (green fn)
Other example:
Woman: what are you doing at my bathroom while I'm showering
Some other dude: without me? (Green fn, they all say in unison)
It means "Green Fuck Nigga!" This refers to making a shot "green" or making a shot "wet" ( when the ball doesn't hit the rim as it goes in). The shooter can say Green FN as they make the shot.
Cody: "You not finna make this shot."
Daniel: "Green FN!!!"