I really dislike the phrase, but let's face it, some people (too many people) genuinely do have a stick in their ass. What does that mean exactly? Well to me it means that too many of their thoughts come predetermined, all of their so called 'knowledge' is basically rhetoric or life slogans of some sort that save them the trouble of real thinking.
Sadly, I believe religion parcels out too much of that. And nothing worse than an inspirational sports idiom dropped on you during a true life crisis.