What does it mean if I got a 37 in the rumination subscale?

Depends on the test. There are a number of tests to look at a person's rumination. The numbers make sense only if you know what the normal range is, and what the highs and lows mean when compared to the average population. If one's score means he is ruminating a lot more that his friends and relatives are, then he is likely thinking about things way too much (such as thinking about that #37 all day long).