noun
pretend play; doing something as a game; just for fun
Used when an action is not serious or is done in a playful, make-believe manner. Often used by children or in casual contexts.
これはうそっこだから、本気にしないでね。
This is just pretend, so don't take it seriously.
子供たちはうそっこのお店屋さんごっこをしている。
The children are playing pretend shop.