だこと

what a ...

→ だ

phrase Rare #33,497

what a ... A sentence-final exclamation expressing admiration or surprise, similar to “How ...!” or “What a ...!” It has a feminine, old-fashioned, or literary feel and is often used with an adjective or noun phrase before it.

JA: なんてきれいな景色だこと！

EN: What a beautiful view!

こりゃまた、豪華な花だこと！

Well, aren't these some fancy flowers!

あら、かわいい女の子だこと。

Oh my, what a cute girl.

まあまあかわいい魔女さんだこと

Well, aren’t you a cute little witch!

— 魔女の宅急便 (1989)

まぁ、見事な花だこと！

Oh, what beautiful flowers!