I can't believe I'm actually responding to this post....
Even though the concept is inherently hilarious, I don't think that such a scenario would be possible.
I doubt that even the most epic emission of flatulence would generate enough thrust to propel much of anything, even through space. Add to that, the 'space-traveler' would have to carry a substantial supply of gas-producing foodstuffs to ensure a steady output. Then, of course, there are certain associated spacesuit design engineering problems to be solved.
Am I over-anal-yzing this?