This thread is begging for graphic language.
If you're wondering where it all goes, it's getting compacted. Think of your digestive tract as a trash compactor. Rabbit pellets are a sign of compaction, and they are the tip of an iceberg, so to speak.
Don't take chemical laxatives unless it's a real emergency. Use water, fiber and exercise, and try to get something out at least once a day. Lay off of alcohol, and tobacco. Drink OJ with pulp, and unfiltered apple juice. We evolved as creatures of the jungle, moving around, foraging for roots, climbing trees for nuts and fruit. We do best eating unprocessed foods, and getting exercise.
You'll get hemorrhoids from forcing a big, nasty butt plug out once a week. A hemorrhoidectomy is pain you've not felt before.
Seriously, you need to find a lifestyle that keeps you regular. Colon cleansing is a scam.