The game has many ways to show individuality and how to stand out from the rest of the players; TF2 taunts are just one of these ways. You can taunt after successful actions, after beautiful kills, or just whenever you are enjoying the game.
In TF2, all classes have different taunts lists. If you don't choose any of the taunts in your slot, the system will automatically choose a default class taunt for you.
To get taunts in TF2, you need to visit DMarket and choose your favorite taunts with the best prices! Or sell tf2 items that you don't need anymore and get money for something more attractive.