The phrase run that back comes from DJ and battle culture, where it means replay a track or line because the crowd wants to hear it again. Online it moved into roast videos, diss battles and reaction edits, where creators add the shout right after a cutting joke to signal it landed. Short clips like this spread on meme soundboards and social video because they are instantly understood, need no context, and work much like the Emotional Damage Meme to turn an ordinary comeback into a moment worth repeating.