From Neyer's twitter feed:
Just learned that Juan Pierre's nickname in some quarters is "Slappy McPopup". #truthinnicknames
As much as Neyer writes and blogs, I'm not surprised that this memo was buried under all of his other (more substantive) baseball items. And I believe--though I can't be certain--that the nickname "Slappy McPopup" was either invented here in a SoSG comment thread, or at least published here very early on among Dodgers blogs (props to anyone who can research this point or validate either way). But at the very least, it's nice to know the nickname lives on, 1745 miles later!