The phrase comes from Counter-Strike, where players use the radio command Fire in the hole to warn teammates that a grenade is about to be thrown. It became one of the game's most recognisable voice lines because it is heard in almost every match, whether in casual play or competitive rounds. As clips and montages spread on streaming and video platforms, creators began lifting the short warning out of gameplay and using it as a punchline cue for explosions, pranks, and surprise moments, alongside other Counter-Strike callouts like bomb has been planted.