Mottainai Grandma is a Japanese term used to show respect for things and to not waste them. It comes from the Japanese phrase "mottainai," which means "wasteful." In Japan, it is seen as important to appreciate the things we have, not waste them, and use them in the best way possible. Grandma is used to represent the older generations who can give us guidance and teach us how to use things in a way that is respectful and not wasteful.