It is likely gas remaining from the procedure. during a colonoscopy they "inflate" your colon to make it easier to visualize and navigate. After the scope is done they try to get as much of the gas out as possible but they can't get it all out. That is why they tell you to try and fart while in recovery. You might try lying on your abdomen, or go from side to side, in attempts to get the gas moving. Don't try to hold in the urges to fart.
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