Japanese Language Stack Exchange is a question and answer site for students, teachers, and linguists wanting to discuss the finer points of the Japanese language. It only takes a minute to sign up.
Sign up to join this community
僕だけがいない街 anime shows the children saying したっけ! translated as 'See ya!' and other terms, these are from Hokkaido dialect.
I guess you can switch したっけ to other forms to say 'See ya': じゃあまた また明日
Anyway, there's any relation with 明日? What is the etymology resulted in したっけ?
The way that したっけ sounds, it's like an affirmation than a question.
No, this phrase isn't cognate with Standard Japanese あした.
したっけ literally means what in Standard Japanese そうしたら. The demonstrative そう is omitted because the whole context before is considered to stand in place of it (colloquial omission of this そう is also common in Tokyo). The っけ part shares the same origin with Standard っけ ("(what) again?"), that is Classical indirect past けり, but has diverged from it to mean "(after it) then".
Thus, Hokkaido-ites say "Now then!" to mean "See you!", but this is exactly parallel to Standard Japanese too, where さようなら literally means さよう ("so") + なら ("if be — then") in older way of speaking.
EDIT
したっけ is seemingly used in the same meaning in Ibaraki dialect, too. Hokkaido dialect is a mish-mash of various Honshu dialects, so it's possible that this part of grammar was exported from Northern Kanto.
したっけ is a Hokkaido-dialect word, which means "See you".
Maybe most natives do not know it.
