Nah in most cultures means "No". In my culture, it means an assuring "Here, take it from me". Only family and close friends use it with each other. With a change of tone, it could also mean a dismissive "That that, sucker!" to a rude person.
Just smile and wave! Do the princess wave! In other news, if you know Jesus in your heart, you don't have to act like a princess b/c you are one. B/c your father is THE KING! So SMILE & WAVE, you princess, you!