(verb) - The act of erasing everything you are about to say on Facebook chat.
This causes the person at the other end to know you're about to say something, and that for them to say something would be like interrupting a face to face conversation.
Usually occurs when fblirting or heated conversation.
also fbackspacing
You're about to say, in an attempt to go on a first date;
Fback means to follow someone back on Instagram or Twitter, for example if someone ask you "fback?" they are asking you to follow them and they will follow you back in return.
I want to F-BAC all night!
F-Bac is so crip!
If you cut you finger then F-BAC Sammy, Do you get a staff infection?
Peter pretends to not like to F-BAC
If you don't get F-BAC, you secretly are obsessed with your own anus
Fback means to follow someone back on Instagram or Twitter, for example if someone ask you "fback?" they are asking you to follow them and they will follow you back in return.