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1. The short bus which carries mentally handicapped individuals to school.
"It's bad enough that I'm already late to class, but now I'm stuck behind the tardwagon."
by Cardmonkey May 26, 2005
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Insult, much like fuckwagon, except it implies that the insulted is more of a retard than a fucker.
"Friggin' tardwagon."
by The Paul April 06, 2005
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