"No worries." Now in virtually universal usage. Began as a sub for the somewhat-off (but not utterly obnoxious) "no problem," and now seems to have expanded in deployment. I offered to help a woman at the post office a few days ago who was confused about how to do something and got "no worries" in response. WTF? I wasn't "worried;" you were. Saying "no worries" to someone in any context, though, is basically the same as saying "relax" or "calm down," when the recipient is hardly ever manifesting any anxiety at all.
Awful.