"Durry" is an Australian slang word for "cigarette".
If you're heading down the servo to grab a pack of durries, it means you are going to the petrol station to buy some cigarettes. Trying to scab a durry means you're asking someone to give you a cigarette. I experienced the word "durry" often when I was younger and hanging out with bogans, but I generally don't hear the word in the other crowds I mix with now.
The internet seems to think that "durry" originally specifically referred to rollies (roll-your-own), however these days a durry can be either a rollie or a tailor (store-bought pre-made cigarettes).