Redheadedone's definitions
The sexual act of putting Skittles up your partner's anus and eating them one by one as they come out.
Bob: I just tried a rainbow tunnel with my girlfriend!
Chris: Could you taste the rainbow???
Bob: Among other things...
Chris: Could you taste the rainbow???
Bob: Among other things...
by Redheadedone October 16, 2014
Get the rainbow tunnel mug.