OO = Object-Oriented; languages like C++, C#, and Java use objects to deliver robust and organized programming. Languages like BASIC are not OO, and can get VERY messy.
As for the joke, I believe there was some huge battle over what Prometheus should have been coded in between the whole team and one team member a long time ago; read the history and the team profiles.
To save Nick the trouble, read: http://main.halodev.org/prometheus/faqs
In a nutshell, it's tool+guerilla+sapien combined with features to make mapmaking easier. This is not a modding app per se; it is a content creation suite.
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