(こいほー) The story behind this trend in Social Media today
03-10-2026
「こいほー」 is the victory cheer used by fans of the Hiroshima Toyo Carp when the team wins a game. “Koi” is the Japanese word for carp, the fish that gives the club its name and mascot, and “ho” is tacked on as a burst of celebration.The phrase grew out of an older internet greeting, “よるほー” (yoruho). On places like Nico Nico Douga, people posted that around midnight, playing on the idea of an owl hooting “ho” at night to mark the change of day. Baseball fans later borrowed the same ending and attached it to team nicknames, so a Carp win became “こいほー,” a Hanshin Tigers win “とらほー,” a Yakult Swallows win “すわほー,” and so on. It spread from message boards and early Twitter into everyday fan speech, and players and staff have used it as well.It trends on social media whenever the Carp win, because fans flood timelines with the word, often with carp-flag emojis, right after the final out. On this occasion the posts center on a recent victory in which Hiroshima stopped the home side from a championship-style toss celebration, with pitching and late hitting both getting credit. The spike is simply the usual post-game chorus from Carp supporters.