Ultron is the artificial intelligence villain created for Marvel's Avengers: Age of Ultron in 2015, voiced by James Spader as a calm, threatening machine. Online editors took that serious image and paired it with crude reaction sounds, turning the character into shorthand for sudden disgust. The throw up version spread in short meme edits and soundboards because the mismatch is instantly readable, even without context. It remains popular for gross out punchlines where a powerful or confident character is brought down by simple nausea.