A state of being far more mad about something than one should be.
Derived from the fact that anything on the internet should not piss you off to the point of wasting your energy on it.
The first impression of this word is that it indicates that the person's pissed-offedness is more serious than average, but in reality it indicates that the pissed-off person is the only one taking the matter seriously. These are usually the kind of people who believe the internet is serious business.
I was a tiny bit pissed that the bus was 15 minutes late, but George was INTERNET pissed, and was about ready to kick the bus driver in the teeth.