GBFO 

Great Big Fuck Off. Very large.

The only way we're going to be able to move all that rubble in time is to get in a GBFO digger.

GBFO by RetSet February 1, 2014

GBFOAT

The Greatest Bakudeku Fics of All Time.

Person 1: Hey, What are the GBFOAT?
Person 2: Anything by MiraChaDoodles is good but it’s hard to choose a few because there’s so many.

GBFOAT by definitelynotshatiera June 14, 2023