Expeditious Retreat and Longstrider both come from Dungeons and Dragons, where they are first level transmutation spells focused on movement. Longstrider increases a creature's speed for an hour, while Expeditious Retreat lets a caster Dash repeatedly during combat. Players often mention them together because both answer the same problem, getting somewhere faster than normal rules allow. As actual play shows, streams, and edited tabletop clips spread online, the pairing became shorthand for a speed buffed character, and creators now reuse the clip whenever a scene needs that specific roleplaying game reference.