The 'Oh No He's Hot' meme originates from the 2002 SpongeBob SquarePants episode titled 'Squilliam Returns.' In the scene, Squidward tries to calm his nerves by imagining his wealthy rival, Squilliam Fancyson, in his underwear. To his shock, Squilliam is depicted as incredibly fit and handsome, prompting Squidward's panicked exclamation. Since appearing online, the template has been used to describe situations where an individual finds someone or something unexpectedly attractive, often to their own detriment or confusion. It remains a staple reaction image for the internet's most relatable moments of sudden infatuation.