A phrase commonly used in World of Warcraft to tell players to avoid spells (like poison clouds, rain of fire, tail
sweep and similar) that often deals
massive damage to players and thus can cause
a wipe.
This phrase apply to all kinds of harmful spells, even if they're not coloured green or coloured at all.
Encounter example:
The early boss Grobbulus in the raid-instance
Naxxramas in WoW have the ability to put out green poison clouds under him. If the raidmembers stand in it they will die because of the damage.
Phrase example:
The raidleader have been explaining the tactics and ends with: "And
don't stand in green shit."
