Flavor text is the text displayed in orange on some item tooltips, in quotes. It is usually humorous. For example, the flavor text for the 
[Kobold Candle] references the kobold catchphrase "You no take candle!", and the flavor text for the 
[Stoneskin Gargoyle Cape] references a real-world meme that sprung from a Thottbot comment on that item.
NPCs
Many interactable NPCs, such as vendors, have flavor or gossip text in their dialogue window that allows the player to interact with them. In some cases NPCs may have holidays specific lines. A large amount of these flavor lines were set to be automatically hidden with Wrath of the Lich King. As an example, the backstory of Galgrom and the text of Tradesman Portanuus on the alternate Draenor will be hidden by default. Hidden gossip lines can be seen by entering the following command in the chat window:
- /run ForceGossip = function() return true end