Meaning of new deep by john mayer?

By "deep" he means complex, or profound, and is probably referring to thoughts. He continues to say that "numb is the new deep" throughout the song, meaning that it is better to numb your emotions than over analyze everything consistently by thinking complexly, or "deeply"about everything because as he says, "deep will only bring you down." I'm sure you've heard someone say "that's deep"after hearing a particularly profound statement or song.