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1.
1. Noun:

The name given to a bus that is specifically disigned for the transportation of retarded people.

2. Noun:
The name used by people who have acheived legendary status in their own way.
Jack: Hey check out that Tardbus driving by.
Phill: Awesome! I haven't seen one of those in a while!

Donny: dude your such a Tardbus!
Frank: Aww thanks man!
by Tardbus_edition April 13, 2010