The Hadouken debuted as Ryu and Ken's signature projectile move in Capcom's Street Fighter series, first appearing in the original 1987 arcade game and becoming iconic in Street Fighter II in 1991. Players input a quarter circle motion to launch it while the character shouts the name. Clips of the shout spread through arcade recordings, gameplay videos and meme edits, often paired with a punch sound for extra impact. It remains a shorthand for retro fighting games and special move attacks online.