The phrase comes from everyday slang where ass is used as a negative judgment, and the clip circulates online as a short reaction sound rather than a scene from a known film or show. Its spread is driven by gaming clips, fail compilations and short form edits, where a two second voice line can sum up frustration without extra commentary. Search phrasing around it includes shit so ass and that shit was so ass, showing how people remember the line in slightly different word orders while looking for the same blunt reaction.