The phrase "King Kong" is a popular culture reference to a fictional character created by Merian C. Cooper and Ernest B. Schoedsack, first introduced in their 1933 film "King Kong." The character is a giant ape that lives on an island and is captured and brought back to New York City, where he falls in love with a woman named Ann Darrow and goes on a rampage through the city.
The phrase has since become a common expression used to describe something or someone of exceptional size, strength, or power. It can also be used as an exclamation of surprise or admiration for something that is particularly impressive.