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2.
A three wheeled cycle used by mentally challenged to pick up cans and slow down traffic. Often trademarked by orange flags, a bell, personalized license plates, and a basket on back.

That retard needs to get his 3-tard off the road.
by Patrick Sierra December 23, 2005
 
1.
Someone who repeatedly signs up for a contract with '3' mobile phone network despite their having virtually no network cover and the worst customer service known to man.
"My sister, Claire, is a complete 3tard. She's just signed up for another two years with '3' even though she gets no signal within 40 miles of her home."
by Shmerkle June 18, 2009