This is when thegayness 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 thissituation under control.
Yo, that nigga Tirrell he tried to put his dick in my mouth; I didn't know he was a chocolate rainbow?
Yum, I wan't that chocolate rainbow.
50 cent is the biggest chocolate rainbow of them all!
When a chap is 'knocking one out' in his leisure time, lying on his back, preferably with someone watching from a distance, and blows a big load- quite high- that lands either in or around the mouth area. Making the shape of a low arching 'milk rainbow', result.
Derived from the ancient red indian word "milainbow" meaning to spunk on ones own face, or the face of a Yak, either by accident or on purpose. Such men in these tribes were worshipped for their big loads, and creative catching with the mouth abilities like a Jack Russell -thus commonly called "Jack-Russelling" in the gay community.