It could be like a dance craze. You start with a baby wiggling around on the floor, then a dwarf comes along and eats it and skips away, then a big guy rocks in and gobbles him up, like a conga line of edible peope nested inside each other.
I don't like having leftovers sitting around so I end up turduckening my dips. So the leftover pumpkin salsa goes into the fresh hommous, and when there's not much of that left it goes into the beetroot and carrot dip.
I'm liking this "the turducken of x" business. A Volkswagon Beetle inside an SUV inside a dump truck could be the turducken of vehicles. A kumquat inside an orange inside a grapefruit could be the turducken of citrus fruit, etc.