It's bile if it's green. It's normal. Every now and then you will see it. I'd only worry if you see it all the time. It's made in the liver and stored in the gall bladder, and to see it sometimes is normal in boas. It's a normal part of digestion.

If you're really interested in the coloring of bile (bilin) read this:
http://en.wikipedia.org/wiki/Bilin_(biochemistry)
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Caden Chapman
slithering.serpents@gmail.com
http://slitheringserpents.com

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