The consensus, idea, plan, story, or set of rules that is currently being used to inform a behaviour. This usage is a generalisation and (deliberate) abuse of the technical meaning. "What' s the theory on fixing this TeCO loss?" "What' s the theory on dinner tonight?" ("Chinatown, I guess.") "What' s the current theory on letting lusers on during the day?" "The theory behind this change is to fix the following well-known screw...." (1994-12-14)