Rotten Arakkoa Egg

As a quest objective
This item is an objective of Of Thistleheads and Eggs....

In lore
They are mentioned in News From Outland: Crisis at Da Portal! official video and in The Journey of Warcraft Legends.

As an object
The Rotten Arakkoa Egg is located in Shadowmoon Valley. The egg will either contain the item or a disease debuff.