"Yatta!"

やった!!!

"Yatta", according to the internet, can be roughly translated as "I/We did it!" But my students seems to use it for everything from picking a good card in UNO to receiving an extra chocolate.

This song captures the joy and exuberance of that word (only partial sarcasm here... it is really happy!). I'm only sad to admit that I found out about it today and not 9 years ago.