Means "You are incompetent or unintelligent." Derives from a bizarre fusion of "you're retarded" and "You're a retard." It's intentionally unclear whether "tarded" is a noun or "a-tarded" is an adjective \.
Man, I can't believe you did that twice in a row. You're a tarded.
by K-Wheezy May 28, 2004
Can you define these popular missing words?