Emotes are a way to communicate by an action, not directly saying something. For example, your character can nod his head yes instead of physically typing or saying "yes."
How to use an Emote
Tap one of the emote keys, by default theses are bound to [ (Left Bracket) and ] (Right Bracket).
To display the Emote Wheel press and hold one of the emote keys and the wheel will pop up.
How to Rebind an Emote
While the emote wheel is displayed hover over an emote and press either [ or ].
After making this item put it into your inventory and use it (Use Item), it will unlock the "Turkey" Emote!
To obtain this emote you need to kill the Dragon and receive the Master Survivor Achievement. You must be near the Dragon within its Boss Arena when it is killed. You do not necessarily have to personally kill it, however you can NOT be mounted on any Creature upon its death, or else you will not receive the achievement. You will still receive the Dragon Trophy and Dragon Flag regardless of whether or not you are mounted.
Despite being classed as turkey emote when doing it you will make sounds of a chicken