A megabloat is a larger jambloat. It means a mistake or bad performance with grave consequences, or a large mistake.
I megabloated my circuit so badly yesterday. Dropping it in water, it went up in magic blue smoke.
A bigger jam than a jambloat, below a gigabloat
Can refer to programs which do not run correctly for a long time
This code works on all the small inputs, but then starts megabloating whenever the logic error is crucial to the execution.