A sticker in the shape of a rainbow members of the homosexual community place on various pieces of their property (usually car window) to let other members know its ok to approach them for anonymous gay sex.
That guy's car has a rizbow! Let's go get our knobs polished in the bushes!
by Hepaki January 21, 2009
Being annoying in a technical way.
I installed a new router and it is pulling a rizbow on my media center connection.
by a BANnned Allstar August 24, 2007