n.

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 27, 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."
"DAEE DUUUURRR DEEEEH!"
by The Paul April 6, 2005
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