铁拳无敌孙中山

Meaning

Refers to the villain Boros from anime "One Punch Man". Since he's completely outmatched by protagonist Saitama, viewers sympathized with him. Because he pilots a spaceship, fans gave him a sunny, positive nickname from a civilian's perspective: "the big brother who flies the spaceship". Used ironically to cheer for the villain during battles: "Go for it, spaceship-flying big brother!"