Metal Slug began as an arcade run-and-gun game from SNK in 1996, and its heavy machine gun became one of the series most recognisable power-ups. Players pick it up to replace their standard pistol with a much faster, more powerful weapon, and the distinctive firing noise quickly became part of the game's identity. As gameplay clips, compilations and retro gaming videos spread online, the short burst was reused far beyond its original levels. It remains popular because it is instantly recognisable to arcade fans while still working as a generic burst of exaggerated action in memes and edits.