Your Rights Online. Essentially, your legal rights while using the Internet, etc. The phrase really starts popping up when discussing file-swapping and web content.
-"Dude. The FBI arrested Toby last night for running Bittorrent too much."
-"Well, wouldn't have happened if he'd only known his YRO.."
When you want to cut down someone on a forum but don't want to get infraction points. After a really stupid post by someone, you quote their post and say