It's all good. . .

Have you ever noticed that all of sudden EVERYONE is using the same, nonsensical expression? It's like pubic hair: You can't remember when it started, or where it came from, but one day you just wake up and everyone is saying "No worries," or "It's all good." Just what are they saying? We had worries before, but now we don't?, or that most people would be worried by what you are saying, but this particular person isn't, so, he/she has to tell you "Hey, I'm better than that, to worry about such a thing, so, No Worries."
It gives me a headache, it really does.