Usually when a tanking class character in a MMORPG taunts a target off another tanking class character with no cause except to make himself feel usefull or important.
Random MMORPG Player : "Man, that paladin has more HP, Mitigation, and a lot higher threat table than that warrior, but the warrior keeps taunting."
Other Random MMORPG Player : "I know dude... that warrior should L2P, he's got total tank envy..."
The mental disorder suffered by prius drivers who lost in their own smug self-righeousness completely overlook that they drive a car as gutless, vanilla and overrated as they infact are.
Do Americans know the rest of the world has super-efficent diesels that do better milage for half the price, guess that's why they have delusions of Prius Envy.
Combined from the phrase "green with envy" meaning wanting what others have, mixing with "penis envy" a Freudian theory. "Greenis envy" is the desire to be more environmentally friendly than another. The obsession over other for green perfection.