Also known as a food stamp card. One might be issued one of these by the government if they're too retarded and/or lazy to work for sustenance or if they're a mooching leach bilking the system and lying about aspects of their lives so that they pocket the cash when selling discounted groceries to others using said tard card.
Jenny: I'm too fucking stupid and lazy to work but whoring around and squirting out maggot children is so much fun.
Steve: Go to the welfare
office and get a tard card so you can at least feed your maggot spawn and your fat stupid lazy ass.
This is when an actor or actress decides to play a mentally retarded person to gain acting accolades like an Oscar, Emmy or Golden Globe Award.
Did you see DiCaprio in, "Whats Eating Gilbert Grape"?
That dude nearly got an Oscar for playing the Tard Card.
The slang name for a handicapped placard.
Jimmi: God, I hope there is parking.
Gee: Don't worry! You have the tard card!
Using a mental disability to further yourself in a situation or to use it as a advantage in doing some sort of activity.
Ivan "So how did you manage to let me ride for free"
John "I had to play the Tard Card on you"