What does Luffy say when he punches?

Luffy shouts the names of his stretching attacks such as Gomu Gomu Pistol when he punches. In multiple fights he stretches his arm and yells the technique name right before impact. This pattern appears when he fights Crocodile and launches forward with GOMU GOMU PISTOL. ch. 200, p. 10 He repeats similar calls against Don Krieg by starting GOMU GOMU then finishing with GATTLING GUN. ch. 65, p. 9 The same occurs against Wapol where he calls GOMU GOMU PISTOL as his fist rockets out. ch. 177, p. 17 Luffy also uses GAT-LING and BULLET variants while striking Lucci and other foes, always naming the move aloud during the punch sequence. ch. 347, p. 15 These shouted names are his consistent verbal cue tied directly to the rubber attacks shown across the sources.