The standard operating procedure on any given night of planned debauchery among male friends. "Natties" being a direct reference to Natural Light and "Fatties" can be correlated with the low caliber of potential female suitors one will undoubtedly pursue.
- Jon, "Yo what's the game plan for tonight?"
- Steve, "I'm thinking the usual, Fatties after Natties."
- Jon, "Word."
Topic or subject which is not easy to discuss/understand. It may also be used in case of an issue from which it is very difficult to draw valid conclusions from, due to its complexity or the lack of expertise on the subject from the speaker, for example.
On the subject of comparing Led Zeppelin and Deep Purple in terms of guitar virtuosity, I think that's a rather nettlesome issue.