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This is when the gayness level in your surrounding area becomes so incredibly high that all males must protect their asses, either with their hands or an anal bum cover
Attention, we are under Code Rainbow here, Bob is acting really gay. We need to get this situation under control.
by Split August 13, 2004
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2
Goes hand in hand with the homometer. When the homometer reaches epic proportions, a Code Rainbow is announced.

Upon announcing a Code Rainbow, all straight males must cover their asses and run.
"Homometer rising, sir! CODE RAINBOW!! CODE RAINBOW!!!"
by Brian Blake December 09, 2003
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3
When a gay person comes to your school
Everybody run: Code rainbow, Zac is BACK!
by Code rainbow is scary March 25, 2017
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