I popped a stash and there was a merge conflict. Unlike the question that is listed as a duplicate, I already had some uncommitted changes in the directory which I wanted to
If DavidG is correct that it didn't pop the stash because of the merge conflict, then you merely need to clean up your working directory. Quickly git commit everything you care about. (You can reset or squash the commit later if you're not done.) Then with everything you care about safe, git reset everything else that git stash pop dumped into your working directory.