Meaning of Mbwenu   Runyaks, Slang / Pronunciation: Mm-boo-wen-nu 1. Meanwhile… Mbwenu is an informal youth Runyankore word to mean “meanwhile” or “but you”.   Example: Mbwenu Cynthia, you said we were going swimming today but you dodged my calls.   Synonyms: [info] Btw, Naye, Hati [/info]