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3.
n. A shower of urine delivered onto the victim by a multicultural group of pissers.
In prison, Sven, Tuan, Rajif, Leroy and Chief Bigbear all gave Stevie a rainbow shower.
av Mango 2 januari 2003
 
1.
Vomit play. Contrast with "golden shower", "brown shower", etc
av Anonymous 29 maj 2003
 
2.
A group of people pissing on one person
"I just sat there under a stream of rainbow showers"
av Chris1372 25 mars 2008