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1.
this is usually a dress code. it means to wear one colour of the rainbow and one colour only.

OR
it could also mean to wear one thing for each colour of the rainbow.
Sally: you goin' to the party? dress code original rainbow!!
Amy: yeah, i'm wearing purple everything :D
Sally: Oh. i'm wearing everything different colours. :)

*party*
by PartyPeece. June 18, 2011