I'm not entirely sure what you mean by "happy tapioca," as it's not a commonly used phrase or term. However, I can provide definitions for the individual words.
Tapioca is a starchy substance that is extracted from the root of the cassava plant. It is often used in cooking and baking as a thickener, and is a popular ingredient in many desserts, including puddings and bubble tea.
Happy, on the other hand, is an adjective that describes a feeling of joy or contentment. It can be used to describe a person's emotional state, or to indicate that something is pleasing or satisfactory.
So, if someone were to use the phrase "happy tapioca," it could potentially mean tapioca that brings them joy or satisfaction. It could also be used as a marketing or branding term to create a positive association with a particular brand or product.