Hadouken comes from Capcom's Street Fighter series, where Ryu and Ken shout it while launching their signature energy attack. Introduced with the original Street Fighter in 1987 and made famous by Street Fighter II in 1991, the shout became one of gaming's most imitated special move calls. The 'matinal' version circulates online as a morning joke, used like a battle cry to start the day. Its short length and unmistakable delivery have kept it popular for edits, remixes and soundboard pranks decades later.