'Which year are you born in?' add the 'Year of the Pig' or 'Year of the Chicken' (or any signs) to indicate you're after the animal sign not after the number of the year.
Fark! phonetics with thai is so hard init, everyones ear is atuned to a different sound I know what he means though, he took Ngert or 'kurdt' as I would hear/say it as birthday like 'wan kurdt'
Maybe try 'pi arai khun ork' ha ha ha what year did you come out!! Bassssh
