SSSniperWolf, real name Alia Shelesh, built one of YouTube's biggest reaction channels in the 2010s, and short disgusted one-liners like this come straight from that format. The exact video this "that's gross" line was clipped from is not widely documented, but the phrasing matches her deadpan commentary style. It spread through meme soundboards and short-form edits where creators needed a fast female reaction, joining a wider wave of reaction memes. Its brevity keeps it useful for quick cuts.