"Oppsa!" and "Uff da!"

My granddaughter  has probably heard "Uff da!" many times during the years.

This time, at the age of 10, she registered I said "Oppsa!"

"You know", she told me, "Oppsa sounds like the brother of Uff da".

Now, a few days later, when I said "Oy Wey" she stated: "You say that a lot. 
Oy wey must be the mother of Uff da and Oppsa."