A fugly loser, essentially; one who not only fails at life and in general, but one who does so in an extraordinarily ironic or awful manner.
A permutation of floser, often mistaken as a f*cking loser.
Mark: ...and so when I tried to sneak the new wireless router back into my house, I pushed the door open with my back, then turned around right into my mom...
2 Anyone who creates a page or profile on a social networking site with the sole intention of promoting their business or political agenda
3 Anyone who is rather characterless or dull on a social networking site.
"Did you see that Congressman Shmoe has a MySpace account now?"
"OMG, nobody cares about his plan to restore fiscal whatever... he's such a fabooser!"
"I never should have taught my fabooser mother-in-law how to use facebook... now all of her fabooser church friends are trying to save my eternal soul..."
"I see that your manager is following your twitter... I guess you can't tweet about what a fabooser he is..."