дефиниция из Urban Dictionary gen.

[andreon]

Full Retard

To act 100% retarded with extra no redeeming special quality.

REDEEM QUALITY-эт что?

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

CHARM PANTS OFF-?

and won a ping-pong competition. That ain't retarded. You went full retard, man. Never go full retard."

[court.jester]

redeeming special quality - redeeming и special там оба прилагательные.
из МТ:
redeeming прил. в начало
общ. искупающий; компенсирующий;

he charmed the pants off Nixon = he charmed Nixon very very much; Nixon was so charmed that he lost his pants

[andreon]

Отлично