Itadakimasu is the Japanese expression said before a meal to express gratitude for the food and everyone involved in preparing it, and adding “se-no” turns it into a playful group count-in, like saying ready, set, go before eating together. The phrase is widely heard in Japanese daily life, anime, cooking shows and social videos, where creators use it as a lighthearted signal that eating is about to begin. Its short, rhythmic delivery makes it easy to reuse as a sound cue across food content online.