What it means
Vaguebooking is posting something deliberately cryptic and ominous online, like sigh, some people, or can't believe this is happening, with no details, so everyone rushes to comment are you okay and you get all the concern without ever saying what's wrong. It's fishing for attention while pretending you're not. The whole trick is being vague enough to bait questions but never actually answering them.
Usage examples
"She's been vaguebooking all week, posting big if true and nothing else, just to get people asking."
"Instead of vaguebooking about being tired, just tell us what's actually going on."
"He wasn't asking for help, he was vaguebooking again with one of those rough night posts and then dodging every follow-up."
"Stop vaguebooking in the group chat and just say who annoyed you."
Where it comes from
A real internet blend of vague and Facebook, coined in the late 2000s when people started posting dramatic, detail-free status updates just to stir up comments. It began as a dig at Facebook behavior, then kept rolling after the habit spread way beyond Facebook itself.
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