Well, it's short for Maureen, I believe, a common enough shortening, except usually it's rendered as : "Mo".
Anyway, this woman named Moe wrote a hit-piece on Gawker.com against a young woman, a college student named Dorian.
Unfortunately for rhyming purposes, Dorian doesn't seem to have a one syllable nickname.
If Maureen goes by Mo,
shouldn't Dorian go by Do?
The reason for Moe's wrath? Dorian did a couple of light-hearted market-themed music videos, including this one: "I'm in Love with Friedrich Hayek".
Which is loads of nerdy fun, in my opinion.
I thought this was the funniest part of the song: