Is that how you make a living? then tell them. A question is only awkward when you think it is.
you: i do online poker for a living.
girl: what so you dont a have job?
You: I know i make money doing what i love its great!
just talk about why you enjoy it briefly and move on, leave it an open thread of conversation to go back to.
you: i do online poker for a living
Girl:what so you dont a have a job?
you: oh well, its just...well gee wilikers, i have a job but oh wait.
then it sounds like you arent proud of your job.
If its that big of a deal then change it but if youre happy with it, they will.