Will doing constant weighted abdominal work make your abs thick looking, almost like a little belly?
They hypertrophy just like any other muscle. They'll get bigger with wighted exercises as long as theres excess cals.
Abs don't have very much growing potential.
True. It is very difficult to get "bulky" abs. Someone who looks bloated in contest shape is not looking that way because they trained their abs with heavy weights.
care to explain please?
Certain drugs and hormones also have several binding sites in the human intestinal tract. This can cause the growth of some internal organs in those who use for long periods of time. Before "Gh gut" was even a term, "roid gut" was present only it was not as noticeable.