What is "UAI" *sounds like "why" in Portuguese?
- Well, It is an expression very common at Minas Gerais area, it can means anything!
UAI= yes/sim
UAI= nao/no
UAI=maybe/talvez
UAI... I don't know, I just saying that to get some time.

Usually, I ask: Is that uai yes, no or maybe?
- I heard once that this expression comes from English influence in the area when they were building the train track.. UAI (maybe).