What is the meaning of 'Wa-su-zo-Tean-o'?

A term popularized in the short story Everyday Use by Alice Walker, first published in 1973. In this story, the character, Dee, is trying to reach back to her African roots and, although she has no real knowledge of that past, begins using the phrase "Wa-su-zo-Tean-o", from the Ugandan language of Luganda to greet her family. Her intended meaning is "good morning" or "I hope you slept well".