sexual slang for the simultaneous consumption of sperm and vaginal fluids by a man and a woman. Named Rainbow after the contrast in colours. term probably originated in Birmingham
"I bet them two had a rainbow last night"
© 1999-2015 Urban Dictionary ®
Free Daily Email
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.