The story
Abbreviation of green fuck nigga. In reference to the NBA 2K basketball simulation video game series, wherein the quality of a player's shot is measured in colours—green denoting the highest quality shot. Online Internet meme documentation website Know Your Meme first attests the word in early 2023 on the video-sharing service TikTok, but popularised in late February 2024 via an Internet meme depicting Family Guy character Peter Griffin shooting a basketball while fading away in mid-air.
Etymology from Wiktionary, CC BY-SA 4.0.