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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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Basically this means a person went too far out of character, in a negative way, and now we don't know this person anymore. However, if this person still has one redeeming quality that we can connect with then it saves that person from this title.

Before the term "Full Retard" became popular it was called acting completely out of character.

This person could be in a movie or a friend or an acquaintance. It would have to be someone you would know or someone that is expected to act a certain way like a police officer, firefighter, judge, etc..
Timmy: "Tom went full retard after his team lost the world series. Nobody needs to jam a hot curling iron up their butt when their team loses. I don't even know him anymore." = Full Retard

Tracy: "Stacy went full retard after her mom stole her boyfriend, for the third time"
Bruce: "Yeah, setting her mom's clothes on fire is so unlike her."
Jimmy: "But Stacy still works at the movie theater and hooks us up so she's still cool with me."
Lexis: "Besides, Stacy's mom has got it going on, and everyone knows that." = Not Full Retard
by Deeez00 May 25, 2018
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