B - Blasto
F - Fan
E - Engine
T - Turbine/Turbofan/Turbojet/Turboprop
J - Jet

Big Fat Engine

@AudioDud3 nah, read the comment right under yours lol

@Alienbeef0421 the T stands for terrible, no jk idk what it means

It could mean/stand for
Big
Failed
Engine
With the numbers after being how many times that engine has failed or will fail in flight

Or it could also mean
Big
Failing
Engine
Again the numbers after mean now may times it will fail

Or it could mean

Best
Failing
Engine
the numbers stand for the percentage of it failing in flight

Or- ok I'll stop there

Blasto Fan Engine, maybe? After all, they're turbofans.
J means jet
T? I don't know

big f*g engine

@Jundroo @AndrewGarrison