吉よし牛ぎゅうMeanings1nounYoshinoya gyudonproduct nameInformal abbreviation for gyudon (beef bowl) from the Yoshinoya chain. Used in casual conversation among fans or regulars.今日きょうの昼ひるは吉よし牛ぎゅうにしよう。Let's have Yoshinoya gyudon for lunch today.