The phrase grew out of internet slang, where oh my god was shortened and paired with bruh as a casual, joking address to a friend, and the clipped, exaggerated delivery made it easy to lift into short-form video. It spread through meme edits and reaction compilations rather than a single film or television scene, with creators reusing the same exclamation whenever something felt too absurd to take seriously. Its staying power comes from that flexibility, working as disbelief, amusement and gentle mockery in the same breath.