Definition #1 (adjective) : A huge screw up when it would be extreamly easy to not screw up. Possibly the biggest fuck up ever.
Definition #2 (noun) : The retard that screwed up.
Homeboy #1 - "Hey bro, did you log out after looking at porn while at the school library?"
Homeboy #2 - "Oh shit, I forgot"
Homeboy #1 - "Ah ha, fucking Beebok, you never learn." or "Ah ha, you Beeboked that"