- an argument by proponents of Jesus-based design that certain biological systems are too complex to have evolved from simpler, "ungodly" predecessors.
- the state or quality of being so complicated or intricate as to be impossible to understand without finally completing that GED.
- anything Michael Behe doesn't understand, e.g., the female orgasm.
- something too hard to understand, e.g. biology. Or a mousetrap. Or a tie pin.