It's an nct reference. Nct (neo culture technology) is a kpop group and this green is their groups colour so when nct fans see this colour they go neo got my back.
It’s this one K-pop group called NCT who’s colour is neon green and also there’s a subunit named NCT 127 which is also the chapter number so there’s like a bunch of things that are the same with the group that everyone is talking about (and also that groups fandom name or something else that idk is named/called neo which is why everyone is saying we I got my back)
Oh and it's chapter 127. Nct has a subunit called nct127. So when nct stans see 127 they say puka puka pow pow, like a sticka, or they say something about a flute. These are references to nct127 songs. Hope this helps!
tf does “neo got my back” mean and why is the comments flooded w that