じゃじゃーん

interjection

ta-dah!; voilà

Onomatopoeic interjection used when presenting something with a flourish, like revealing a surprise or showing off an accomplishment.

• じゃじゃーん！見みて、新あたらしく買かったカメラだよ。

  Ta-dah! Look, it's the new camera I bought.

• ケーキができたよ。じゃじゃーん！

  The cake is ready. Ta-dah!