“3 is the magic number spiderman” is an idiom that denotes an exaggerated claim or an outcome that is unlikely to occur. The phrase originated from a 1960s Spider-Man comic book, where the titular superhero faces three daunting challenges.
The phrase has gained popularity due to its inherent humor and relatable nature. It suggests that a particular scenario is not achievable due to the overwhelming odds. In real-world contexts, it is often used to jokingly express skepticism or to downplay the significance of a challenge.