Nossa in Portuguese means "our". It refers to "nossa senhora,"
which means "our lady.". Portuguese speakers say "our lady!" in
much the same way that English speakers say "oh my lord!".
Therefore, "nossa!" is like saying "oh my!"
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"Deus abencoa a nossa casa" is Portuguese for "God bless our house." It is a common expression used to seek blessings and protection for one's home.