It is like an "ok no" or a "just kidding" but it can be interpretated as I'm not sure if I should say that, so don't take it seriously

A term used to reference cannabis/marijuana/weed.

(?) is a magical symbol, famous on the internet for some years but used since many more in several books. At one time it was used in chess notation to mark inexplicable plays. If you will use it in the newspapers today would go after any political statement made by Donald Trump.

(?), which has no name, in certain cases indicate sarcasm (1), others warn that such stupidity is illogical on purpose (2), in others alert idiot readers that that's a joke and should laugh or go to hell (3), and others simply serves to hide ugly opinions (4).

When you're not sure if your answer it's right or based on factsbut you're totally sure that's how you know it; or when you share a piece of information with someone that just assumes that from your point of view you're right. Used mostly on the internet, at the end of the phrase and it supposed to put that phrase into the questionable state.