A system where you spend a good portion of your time at a computer, perform repetitive tasks to be promoted a level, fight with fellow players, and occasionally deal with boss creatures. Its just like work, only difference is you pay a monthly fee instead of BEING PAID a monthly fee.
Dan: Dude, I spent all of last week goldfarming on 'GalacticMedievalQuest' and I'm now a Level 34 Space-Elf Druid.
Bill: Thats nothing. I spent most of last week playing office politics & delegating responsibility at Initech Corp and I'm now promoted to Middle Manager. Plus they're paying me $10,000/mo.