The phrase comes from everyday small talk, the automatic answer people give when asked how their day went, regardless of the truth. Online, that ordinary politeness is exactly why the clip works as a joke, because short audio of a familiar line can be reused in endless new situations. It has spread through soundboards and short video edits as a reaction clip, kept alive by its versatility rather than a single viral moment. The deadpan meaning is understood instantly, even out of context.