The “Emerald Splash” is the main used power of Kakyoin (the main jojo’sbest friend of part 3) his stand is called Heirophant Greenwhich also has many ability’s, the emerald splash was very important because it was used to reveal dio’s stand ability by hitting the clock tower with his emerald splash
The emerald splash is often memes like when someone says:
Person: Nani nobody can just deflect the emerald splash
Which is used to make fun of kakyoin from episode 3 where he uses the emerald splash on Jotaro and he punches all of them and some back to kakyoin rendering the emerald splash useless Another meme would be when someone says:
Person: baka na KAKYOIN!
Refering to when dio killed Kakyoin by punching a whole through his chest but Kakyoin used his emerald splash to show dios stand ability after he died by hitting the clock tower, to eventually show Diocould stop time whith his stand ZA WARUDO or English version The World.
Person 1: is it possible to deflect the emerald splash?
Person 2: Nani! Nobody can just deflect the emerald splash
One of Hierophant Green’s most well-known attacks that no-one can deflect, but everyone can dodge. There is a variation called the 20 Meter Radius Emerald Splash which is only used once.
A attack used by Noriaki Kakyoin from the manga/anime series Jojo's bizarre adventure Stardust Crusaders that has been used very often against the antagonists in the series, to sum it all up quick of how it works, go read below.
Kakyoin: Take this, emeraalld splaaashhh!!
Villain shoves it off as if it's nothing Kakyoin: What, but there's no way. No one can just deflect the emerald splash!