A person who is so fuckin stupid or does stupid ass stuff.
Bobby: I think im going to light this candle near this gas station.(BOOM)

Tom: OMG wat the fuck. That was some real dumbasstedness - dumb/ass/ted/nes shit right there
by Chyna .J June 28, 2008
mugGet the Dumbasstedness - [dumb/ass/ted/nes]mug.