The 'One-Punch Man' meme, specifically the 'OK' face, originates from the webcomic and later the anime adaptation of the series. It features the protagonist, Saitama, reacting with a deadpan, simplistic expression after the formidable villain Boros explains his tragic backstory and immense power. The stark contrast between the high-stakes, detailed art of the battle and Saitama’s minimalist face turned the scene into an instant viral hit. It is primarily used to represent boredom, unimpressed reactions to grandiosity, or a general lack of concern in the face of supposed danger or complexity.