Hadouken debuted as a special move in Capcom's Street Fighter series, performed by Ryu and Ken by thrusting their palms forward to launch an energy projectile. The move became widely famous with Street Fighter II in 1991, where the shouted attack name turned into one of the most quoted lines in arcade gaming. As fighting game clips, parodies and remixes spread online, the shout escaped the arcade and became a universal shorthand for launching a powerful attack, which is why creators still use it decades later in memes and fan edits.