In this tutorial, we learn Japanese slang "kakkoii" or "cool". The word we will learn is "kakkoii" which describes something that is cool, looks awesome, or sounds cool. So, if you wanted to describe a band that sounds cool or say someone is cool, you would use this word. There is a small "su" in the word that you will need to learn how to pronounce when you are saying it. "Mabui" is a word that you would to describe for a girl that is really hot with a nice body and face. For the ladies, if you want to say a guy is good looking or hot, you would say "kakkoii".