Long story short is a familiar English idiom that creators use as a verbal shortcut, and short clips of the phrase circulate widely on soundboards and in short-form video because the wording itself does the editing work. It fits naturally at a turning point in a story, a vlog or a meme, where a long buildup needs a fast, recognisable exit. Its staying power comes from that flexibility: it works for comedy, confession, gossip and recap alike, and audiences understand the cue instantly without needing any context from the original recording.