That’s not really what it sounds like.
I was riding the bus yesterday morning to go meet one of my Korean tutors.
On the bus they have these TVs that display route information, advertising, weather, and occasional “features.” The feature I saw was a silly cartoon about some larvae that live in a storm drain. When I got home I decided to try to find these larvae on the internet. I did.
I couldn’t find the specific episode I saw, which involved a man dropping a ring into the storm drain and reaching down to retrieve it, and the subsequent epic battle between the disembodied hand and the larvae who live there. But I found the episode below, which involves a massive amount of prehensile snot.
라바 [raba = larva], “콧물” [kongmul = snot].