"Yaya" can have different meanings depending on the context and culture. In some cultures, it is an affectionate term for grandmother or an older woman, while in others, it can refer to a younger sister or a term of endearment. Additionally, "yaya" can be used in informal contexts to express excitement or joy. If you have a specific context in mind, please provide more details for a more accurate definition.
Geographically, it is a large area of water (a bay or sea) but always an arm or extension of a larger body (a sea or ocean). The word "gulf" can also mean a wide gap, space, or void between things or places.