The Troll Face Emote is a taunt that appeared for the first time and could be bought for 1000 ZCoin on April 1st then removed from the Marketplace. Since then this taunt has been reintroduced at various other (random) times.
When used the Troll Face Emote causes the agent to shrug, raising the palms of his hands as a holographic troll face appears in front of their helmet.
The Troll Face Emote is a reference to the internet meme; Troll.
According to Domino, the Troll Face Emote will never be available again due to copyright reasons. [Source needed]