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1.
Where there are tons of little, or quite large, bruises on your legs, arms, various parts of the body in different colors, causes may include abuse, weakness, etc.
Girl: "Oh my glob, there is a deadly rainbow on my leg!"
by le.git.broster April 22, 2012

Words related to deadly rainbow

abuse bruises deadly disease illness injuries rainbow sickness
 
2.
A person who is really messed up in the head :D
Deadly Rainbow Ran over to her Vespa and sat on while screaming "TAAAAAAAAAA-KUUUUUUUUUN!!!!!!"
by Jes (Deadly Rainbow) May 14, 2004