Etymology: Combine one part "broken" and one part Swedish Chef and you get "borked."
That mechanic borked your car.
Admin: I totally borked my machine installing Win XP SP2.
"I can't come over at the moment...my car is borked".
Also applicable: borking, bork
"The whole project was borked, so I had to start over."
"What the bork are you doing?"
This use of borked is rooted in the traditional defination, to obstruct by defimation &co. in this sense the obstruction is the fucked up, not working ness, and the defimation is that it is beyond all recognision.