"Roid-Gut" I THINK is caused by an unnatural increase in Growth Hormone which enlarges the internal organs and thus makes your gut look huge.
From this website that I do not claim to be credible.
http://www.labtestsonline.org/unders...ne/sample.html
"Increased GH levels can lead to enlarged hands and feet, enlarged facial bones, carpal tunnel syndrome, and abnormally enlarged internal organs."