A direct translation of 'pai nai' is 'where are you going? ' (pai=go nai=where) to which the typical response would be 'pai thiao' which is similar to saying 'out and about' or 'going for a stroll'.
People Also Ask
You might get asked: "Bai nai?" - "What are you doing?" which is often used instead of "How are you?". A good response is: "Bai tee-o" which means "I'm going out socially".