B-LOC:  Pronounced “bee-lock,” it is a play on the term “G-LOC,” or g-induced loss of consciousness, which is a blackout caused by loss of blood to the brain during high-g maneuvering.

B-LOC, on the other hand, is boredom-induced loss of consciousness, and may be the result of hours of mandatory briefings or even briefed as a potential threat for a very, very low-intensity sortie.

See more fighter pilot terminology at Fighter Pilot Speak.