Tee,
Technically, "nossa" does not mean wow - it is used in Brazil as an expression of surprise, etc. - depending on the way it is used, then it can be used as 'wow"
It is not used in Portugal in that way
"nossa" only means "ours" to "female" things, for example:
nossa casa - our home
nossa terra - our homeland
nossa mesa - our table
"nosso" is used for the male:
nosso carro - our car
nosso computador - our computer
nosso quintal - our yard
etc.
I don't believe it is worth that much without branding.