Somewhere Over The Rainbow Meaning

(idiomatic) at an unknown, hypothetical, or very distant place

Example: 1996, Ann DuCille, Skin Trade
  Perhaps somewhere over the rainbow there is a land where equality and justice are colorblind, where no one is the other, where no one by virtue of race, gender, or sexual orientation is an outcast or an anomaly.
1939, Judy Garland, Over the Rainbow
  Somewhere over the rainbow
  Way up high,
  There's a land that I heard of
  Once in a lullaby