Big Fat Worm

Penis

If you were confused. The name is “Gun Goo,” which is loosely based on Vietnamese Con Cu. Con is a classifier for animals or impersonal, like con chó (dog), con mèo (cat), and con cá (fish), and refers to “small,” “little,” and strangely, “child.” Ex: con cái (children). Cu meaning is ‘ding-dong’‘dick or cock’ expression for this organ. Also represents the sound Cuckoo (Cock-a-doodle-doo)

So, basically, it is a cute little penis.