you could get diverticulosis, however a colon rinse won't do anything for that. IMO colon rinse = worthless. Try eating more fiber. Even a fiber supplement is better than nothing. I use benefiber and I can't even taste it when it's mixed up, however I'd mix with 12oz of water instead of the recommended 8oz.
http://en.wikipedia.org/wiki/Diverticulum
edit: obviously I'm not a doctor
Actually, the only thing your body WILL NOT completely dissolve is vegetable fibers, they will make most people bloated and may cause some some discomfort but they will NEVER rinse anything out (i imagine people expect them to act like some sort of brush to clean your intestines, be very glad that they don't, you'd need an operation everytime you ingested them if they did).
No meat, no matter what sort or how much will ever clog your intestines, it will either be completely dissolved or passed out by the natural means, it will never get stuck anywhere, not even 1/10 of a gram of it.