I've never understood how wasting time on the job can possibly be termed 'theft'. It's irresponsible and a failure to fulfill expectations, but it's not theft.

(btw, I also don't see employers as stealing life from employees)

Accepting payment for services which you purport to have rendered but in reality have not.

I would use 'fraud' instead of 'theft', though in reality it's close enough.

Theft of labor resources, if you're salary non-exempt and reading HN is not in your job description :-)

I understand the definition of it. What I don't understand is the use of the word 'theft'. "Misappropriation of resources which exceeds our standard of what is reasonable," perhaps, but not theft.