The Japanese phrase ( Shinseki no ko to o-tomari dakara ) translates to: "Because I'm staying overnight with my relative's child."
However, based on the specific phrasing, it seems you are asking about the famous Japanese martial arts technique from the anime/manga series Fist of the North Star ( Hokuto no Ken ). shinseki nokotowo tomarida
("You are already dead.")
親戚の子とお泊まりだから (Shinseki no ko to o-tomari dakara) Crunchyroll, Hulu The Japanese phrase ( Shinseki no ko to