Green fn

As you are hitting a killer shot in basketball you say green "fuh n*gga". Shortened to Green fn.

Person 1: yo imma hit a killer shot
Person 2: bet
Person 1 as he's hitting a killer shot : green fuh n*gga
Person 2: holy shit no way dude

so yeah as you are hitting a killer shot in basketball you say green fuh n*gga or green fn for short