NEW YORK — In the wise words of James Corden, there comes along a song every so often that defines a generation.

Doo doo doo doo doo doo.

The late-night TV host, carpool karaoke king and father of three young children was referring specifically, and wryly, to “Baby Shark,” now the bloodthirstiest of earworms for some parents and meme lovers everywhere.

Insert shark hands here.

If you don’t know what I’m talking about, you’ve been living inside a sea anemone since at least 2015. That’s when an educational content brand in South Korea, Pinkfong , released its first shark video, later breaking the internet with a version mixing animation and two adorable human kids dancing out the story of a shark family, K-pop style, earning more than 2 billion views on YouTube .

If you still don’t know what I’m talking about, you haven’t spent enough time at summer camp or around a campfire, where singalong versions of said story with said gestures, akin to an old nursery rhyme with the same theme, have rocked on for decades.