Ahh....the shopkin phase. This phase takes place in young, usually female, children--typically in the age range from 6 to 9 (no 69 joke intended). The phase is where these young children become obsessed with shopkins, a small and creepy collectible toy that is in the shape of an object you can buy at a store, like the milk your dad is still getting.
Later on these same kids remember this phase and would do anything to forget it (see italic letters).