Green’s Dictionary of Slang

retarded adj.

1. (US) a general negative; stupid, bad, inferior.

[US]E. Wilson Look Who’s Abroad Now 207: They taught you all about the International Date Line in school, but if you’re as retarded as I am, you still don’t quite believe it.
[US]I. Freeman Out of the Burning (1961) 147: Hearing him, Littel Man was inspired to crack the same machine shop by himself only three days later. He was that retarded.
[US]R. Woodley Dealer 23: ‘The cost of living is so fuckin high it’s retarded, man’.
[US]J. Ellroy Silent Terror 18: [A] jewel-thief hit man who [...] snarled a retarded version of Nietzsche in oversize speech balloons.
[US]D. Gaines Teenage Wasteland 94: She was generally (though inaccurately) described by her peers as ‘retarded’.
[US]N. Green Shooting Dr. Jack (2002) 57: You think I’m fucking retarded, is that what you think?
[US]T. Fey Mean Girls [movie script] So then her mom called my mom and started yelling at her. It was so retarded.

2. (US black) intoxicated by a drug or drunk.

[US]Ebonics Primer at www.dolemite.com 🌐 retarded Definition: 1. getting high 2. actin goofy while under the influence. Example: Ya man lets go get retarded!
[US]Eble Campus Sl. Nov. 6: retarded – drunk: I have some beer in my room, so let’s get retarded.
[US]A. Steinberg Running the Books 64: He would narrate freewheeling sagas of [...] the various drugs taken before, during, and after [...] the old days, when he used to get ‘fuckin’ retarded’.