Hm. Well, with thanks for the contributions, I must second bilby's comment. There is the list Specific Excrement, and May or May Not Be Specific, But It's Definitely Not Excrement, neither of which contain exclusively slang poop-related terms. The latter is for words that sound poo-related, but are not. This one is for words that sound like they are related to wee (or urine, if you prefer), but are not.
With thanks for your thoughtfulness, I must respectfully suggest that poo-related slang term entries belong on another list—an "Urban Dictionary" list perhaps.