だっ

is, am, are

→ だ
auxiliary Rare #40,643
is, am, are An abrupt, emphatic spoken form of だ, often used in exclamations or when speech is cut off.
JA: ここだっ!
EN: It's here!
Conjugation of だ

どこだっ!

Where is it?!

— すずめの戸締まり (2022)

そりゃだめだっ!

That's no good!

わっだっ大丈夫?

Whoa—are you okay?

— Cosmic Princess Kaguya! (2026)

うわーだっ!

Whoa—ah!

— Godzilla Minus One (2023)