Geppo is one of the Rokushiki martial arts techniques in One Piece, allowing trained fighters to kick the air hard enough to stay aloft and move through the sky. Sanji uses his own version, Sky Walk, after the two-year timeskip, turning it into a signature mobility move for aerial fights and rescues. Short clips of the stepping whoosh spread through anime edits and soundboards because the effect is instantly recognisable even without visuals, making it a reusable cue for flight, speed and impossible jumps in fan videos.