This title comes from a saying that Past President Barack Obama and his Wife Michelle often said. It came across as a family motto, which is a very positive way to think about things. It essentially says that when others resort to lies, insults and immoral tactics to bring you down and make themselves look good you take the moral high ground.
However, going high, which is essentially acting like a good human being, is something that I would say should not be limited to scenarios where others have gone low. Being a good human being is always a good way to live. We can never be a good human being all day every day, as we have challenging times that cause us to waiver, but the intention is what matters. Think good and be good is my advice.