The 'Cousin Throckmorton' meme originated on Tumblr in 2018, stemming from a medical textbook diagram illustrating the 'Throckmorton sign'—a slang term in radiology regarding the orientation of anatomy in relation to hip pathology. The meme reached legendary status when a user humorously claimed that Throckmorton was their cousin and a professional skateboarder. This surreal juxtaposition of dry medical imagery with the specific, absurd claim of a skateboarding relative turned the name into a shorthand for nonsensical, high-concept humor. It is typically used in shitposting communities to evoke a sense of bizarre familiarity or to mock overly technical diagrams with ridiculous personal lore.