What does "Never an honest word" mean?

Native speaker’s answer
Rebecca
Great question. This phrase is not an expression of idiom and was created for this song, which means the meaning is up to each person. In my opinion "once you go" means once a person, in this case the subject of the song, turns evil, there is "never an honest word" meaning he does not speak the truth anymore. Put simply it means that "after you turn bad (once you go), everything is lies."