"For Colored Girls Who Have Considered Suicide When The Rainbow Is Enuf" out Nov 11

Tyler Perry's production of 'For Colored Girls who have Considered Suicide when the Rainbow is Enuf' was supposed to open during Martin Luther King Holiday weekend 2011, but Tyler pushed the date up so he could be considered during this year's award season. The new opening date is November 5.

What the heck kind of title is "For Colored Girls who have Considered Suicide when the Rainbow is Enuf"?
What's the literal meaning? I read literature in school but this one pass me...
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