Something from the anime/manga series βFist of the North Starβ, meaning βyou are already dead.β And then the person it has been said to dies. If you hear this said, it is completely unacceptable to not say βNani?!?!?β.
"I am already dead"
Deriving from Omae wa mou shindeiru, it is usually used unironically among friends. It is also a cry for help that will be laughed at as you circle into the depths of despair, leaving behind any sanity you possess.
This is only used in the highest profiles of the highest edgy memelords. it can be used to absolutely destroy an opponent in battle. Only the best can use it. It means βyou are already deadβ but will instantly kill your opponent in an anime battle.
'You are already dead' in Japanese. Legend says that if you say "Omae wa mou shindeiru." to an opponent, their response will always be "NANI?" meaning 'WHAT' in Japanese. Then said opponent will die. If 'Nani' is not said, then...? The opponent will die anyway though.