This sound is associated with Deadpool, the wisecracking Marvel character best known from the live-action film series. Short Deadpool voice lines spread widely in fan edits and reaction clips because his delivery is instantly recognizable and naturally punchy. A brief greeting like this stays useful online because it fits many setups: surprise entrances, sarcastic acknowledgments and quick comedy cuts. It also sits in the same reaction-sound space as other short character quotes that creators drop into fast meme edits.