The line is Davie504's trademark reaction, coined by Italian bassist and YouTuber Davide Biale in his bass challenge and meme review videos. When a viewer submits a bass line or meme so absurd it seems unplayable, he leans into the camera and delivers the catchphrase with theatrical disbelief. Clips of the moment were ripped to soundboards and meme edits, where it became a universal reaction to impossible feats, glitches and skill clips. It endures because the delivery is short, quotable and unmistakably his.