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1 definition by mvn64

Usually a school bus which is about
half the size of a regular school bus
which is used to transport the disabled/
handicapped along with those students who have discipline problems and other
issues where they are kept away from the
"normal" students.
"My son may not be a genius, but at least he doesn't take the retard bus
to school!"
by mvn64 November 21, 2004