やった

Etymology 1
From the past tense of やる, literally meaning “I did it”, “you did it”, or “he/she did it”, the subject being implied in a context. In the case of interjection it always means “I did it”.

Interjection

 * 1) hurrah! yay! I made it! an interjection expressing approval, appreciation, or happiness.

Verb

 * : was