It can mean one of two things, at any possible moment, and possibly two things at any moment.

It can either mean "hey, no problem man, it's cool!" and that's it. No worries - literally. Whatever happened? It is what it is, it's done, etc. Let's just move on and do whatever. Preferably positive things but yeah.

It can also mean something else. "Don't worry about it. You'll get what's coming to you. :)". An eerily cheerful thing, I don't like to make big deals out of things, and I don't like to cause problems. But if pushed, there's big problems in store for you. And it's just gonna happen. ;P

One sad soul found this out the hard way, so I figured I'd put it out.

…It takes a lot to push me but when I do I'll usually have no build up, no gradual increase of anger. I'll just snap..

Half-rant done and stuff.