Facebook Maybe 

Can be defined as a way of letting the Facebook event's organizer know that you will attend the event if you got fuck all to do.

Jebediah: "Yo bromosapiens! This hot gurl invited me to her Bar Mitzvah on Facebook."
Demarcus: "Greetings, Jebediah! Sounds lovely, will you attend?"
Jebediah: "I dunno man, it's not like I got anythin' swagger to do, u feel me?"
Demarcus: "I suppose an adequate response to the invitation would thusly be a Facebook Maybe"
Jebediah: "DAS RITE"

Facebook Maybe by Brobi Wan KenoBro May 19, 2016

Facebook Maybe 

A polite way of saying no.
Derived from the option of 'maybe' when RSVP-ing to an event on facebook.

That cute girl from history invited me to her little sister's diabetes fundraiser, so I gave her a facebook maybe.

Facebook Maybe by K.SO November 8, 2009