The term is used by Yuma as a catchphrase, created by his father, Kazuma Tsukumo and was passed on to him. Yuma considers it to be among the most important things his father ever taught him. According to him, the meaning behind the term is to never give up even if it seems impossible, to always challenge, and to believe in oneself. Yuma follows this thought firmly thanks to the pendant his father gave him, which makes him feel like his father is always with him and thus makes him able to "kattobingu", no matter how much other people laughed at him.