Edit: Downvote me all you want, it's the difference between literally taking a dump on something and figuratively doing so. Words matter. If that offends you, maybe you aren't as open to knowledge as you think.
Also, since I see no reason why grammarist is more trustworthy than wiki, you're not even necessarily right: [from wiki] "A pooh-pooh (also styled as poo-poo)..."
I'm right. Did you look at the wiki reference? It's a book called "Seventeen Versions of Jewishness: 20 Examples" by a comedy/children's writer. More likely that example slipped by the editor.
Otherwise, that's been my experience with GoPro as well.
[0] http://grammarist.com/usage/poo-pooh/
Edit: Downvote me all you want, it's the difference between literally taking a dump on something and figuratively doing so. Words matter. If that offends you, maybe you aren't as open to knowledge as you think.