ubo sí adv /ū.bō sí/
Definitions
  1. where interrogative
Dialect
Ìjẹ̀bú Òde, Ẹ̀pẹ́, Ìkòròdú, Ṣágámù, Abẹ́òkúta dialect form of níbo pron
Etymology
From ubo (“place”) + sí (“marker”). The use of "sí" can be seen in many interrogative forms in spoken varieties in the Èdè-Yorùbá-Ìṣẹkírì language continuum such as Ìjẹ̀bú. Cognates with Èkìtì Yoruba ubi sí, Ifẹ̀ Yoruba ibi sí
Component words
Source: Wiktionary, where this word is spelled “ubo si”. Reference: en-ubo_si-yo-adv-tIERwQxl