The sayin as I know it comes from the show In Living Color. In one of the skits, Homeboy Shopping Network, the two actors are always telling you how you can save money. When the skit was shown, it became a very popular phrase.
"...get mo money, without spendin yo money"
"MO MONEY, MO MONEY, MO MONEY"
When confronted with the accusation of having spent far too much class time covering trivial topics like pharmacogenomics, mo-money will simply respond with an excessively-high pitched squeal of the words "too bad!"