The line comes from Hearth and Home, the animated short for Hearthstone, Blizzard's fantasy card game built around a warm tavern where players gather to play. In the short, the innkeeper greets a weary traveller who has come in from the cold, and the brief Oh Welcome has become the moment fans remember for its hospitality and humour. Shared as a short clip, it spread through game edits, streams and reaction videos, where its friendly tone still works as a quick way to welcome someone into a scene.