Interesting Things: Good Luck

Stopped at a corner, waiting for the green light to walk.
A couple walks up next to me.
The guy asks me, "Spanish Spanish Spanish Spanish...blah blah blah?"
I say, "Repeat that please?" (In Spanish)
He says in response, "Nevermind, Where are you from?" (In English)
I say, "Los Estados Unidos" (the United States)
He says, "Ohhhh..."
I say, "Buenisimo!! Verdad?" (Great!! Right?)
We're walking now, and they're in front of me.
He says, "Good luck!" (In English).  His girlfriend laughs.

I'm not quite sure what happened, but I still just want to know what he said in the first place.