Is green poop green all the way through? Or is just the top layer of the poop green and the middle brown?
This calls for an experiment. Dissect it and find out. 
Pretty much green all the way through…
For those interested, green feces are usually caused by purple food dye, like what’s in grapde Kool-Aid or similar products.
No, so that’s one way you can tell it’s not an avocado.
If you find green poo in a baby’s diaper, it probably doesn’t mean the kid’s been sneaking grape Kool-Ade.
It’s time to stock up on Pedialyte, bananas, rice, applesauce, and toast.
~VOW
Likewise, if your toddler’s diaper has blue feces, it probably means he or she ate a cake with black frosting (which is actually a very concentrated blue). When my stepson was little his school had a birthday party with a thusly-decorated cake, and afterwards there was a swarm of panicked parents.
since there have already been serious answers, I’ll offer this chestnut: a thread about “green poop” is not what you want to see while eating curry.
Personally, I don’t want to see any poop while I’m eating curry. YMMV
Why, upon seeing a green turd (presumably in the toilet), would you even suspect that it wasn’t green all the way through? I don’t care what color my poop is, I would expect the middle to be the same color as the top.