No widely documented film, television or viral video source has been attached to hashtag shit, and it circulates mainly as a short user-generated soundboard clip rather than a quote from a known character. That low-key origin fits its use: creators borrow it as a ready-made reaction rather than a reference that needs explaining. Shared through meme edits, reaction videos and short-form posts, it has stayed useful because the phrase is instantly understood, the delivery is short enough to place anywhere, and the joke is the bluntness itself rather than any backstory.