What is durfing?

"Durfing" is not a widely recognized term in English, and it's possible that it is a misspelling or a niche term that might not have widespread usage. If you have more context or if it belongs to a specific subculture, hobby, or community, please provide additional details, and I may be able to help you more effectively. Alternatively, it could be a neologism or a slang term that developed after my last update. Let me know if there's anything specific you need!