Tard Waggon 

Special class busses, that looks like regular yellow school busses yet have a shorter length.

"Dude, your driving sucks so much you should be driving a tard waggon."

Also seen in the movie "Roadtrip"

Tard Waggon by crudent June 15, 2009

Tardwagon 

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."

Tardwagon by Cardmonkey May 31, 2005

tardwagon 

Insult, much like fuckwagon, except it implies that the insulted is more of a retard than a fucker.

"Friggin' tardwagon."
"DAEE DUUUURRR DEEEEH!"

tardwagon by The Paul April 6, 2005