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1.
A term describing a person or endeavor that is of a lower standard than even the conventional definition of retarded.

Also:
Thornspawn
Black Witchery
football
I cannot believe that Osmose signed such subtarded bands.
by Anonymous January 05, 2003
 
2.
The state of mind engendered by any level of sleep deprivation, most notably accompanied by a highly likelihood of laughing--often hysterically--at something that, with a normal night's sleep, would normally be categorically unfunny.
I don't know what that kid just said, but I'm subtarded enough to think it was funny
by Hipp April 23, 2005