Rainblow is the practice of having several females, each wearing differant colored lipstick, performing oral sex on a man. This will leave a rainbow effect on his penis.
The girls at the party last night gave me a colorful rainblow.
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When a woman is giving a blowjob and you stick your dick too far down her throat, making her choke.
As I was getting a fantastic blowjob, I pushed the back of her head causing a blowchokie.