You're going to ask this a lot to almost everyone who knows Marwari. They won't be surprised to hear it but they'll definitely get the feeling of 'he/she is one among us'.
Even this question has two forms of asking. One is for the male and the other is for the female.
1)Asking a male
What are you doing?
Translation:
Tu kai karriyo hai?
2)Asking a female
What are you doing?
Translation:
Tu kai karrahi hai?