noun: An intentionally vague or one-worded status update, alluding to something else. This could be an inside joke, or anything meant for only a few people. More simply, it could be a plea for someone to comment. Such as "pointless", "frustrated", or any inside joke.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

To seek sympathy and/or attention by posting something vague as your Facebook status. Usually the only people who ask you "What's wrong??" are lonely stay-at-home moms who want some extra gossip. The rest of the free world does not give a shit and wish you would just suck it up and shut the fuck up.

Vague Book (or vague booking) is the act of calling someone on their bullshit via social media yet you are to big of a pussy to actual tag said person in you act of attempted bullshit calling.