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To act 100% retarded with extra no redeeming special quality.
Downey: "Everybody knows you never do a full retard."

Stiller: "What do you mean?"

Downey: "Check it out. Dustin Hoffman, 'Rain Man,' look retarded, act retarded, not retarded. Count toothpicks to your cards. Autistic, sure. Not retarded. You know Tom Hanks, 'Forrest Gump.' Slow, yes. Retarded, maybe. Braces on his legs. But he charmed the pants off Nixon and won a ping-pong competition. That ain't retarded. You went full retard, man. Never go full retard."
by D. Ocean August 28, 2008
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Phrase used by Robert Downey Jr.'s character in the movie Tropic Thunder. Referring to when an actor playing the mentally retarded goes all out leaving the viewer unable to connect.
Sean Penn went Full Retard in I Am Sam
by Dane Adi August 25, 2008
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A full retard is a person that is retarded to a greater extent, or an individual that spazzes out uncontrollably from excitement that would mimic a person with Down Syndrome. A person that goes full retard that is retarded can be incredibly dangerous, as they can generally black out from emotions such as rage if under emotional distress or if they feel threatened they will have a loss of physical arm movements and can feel no pain. If they start winding up a windmill punch and it happens to connect, it can be incredibly devastating, if not lethal, to the individual receiving the blow. A person without the physical retard strength that can go full retard will have a loss of neck control and will make a lot of noise.
Did you see that homeless dude go full retard when those guys took his sandwich? I thought he was getting hyphy until I realized he was actually retarded.
by Uncle Renegade April 08, 2017
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