As we all know, Toy Tanks (or Tonks) have been a part of Warcraft history for a long time. First introduced in Patch 1.10 as part of the Darkmoon Faire, Tonks have been a part of our life ever since.
The Tonker is a class that weaponizes the Tonk.
Now, unique to this Class, they are unable to deal any real amount of damage with their abilities. Tonks are, after all, just toys.
But they can annoy the enemy. They can annoy the enemy so much that the enemy starts taking more damage from all sources, as they drop their guard in fury. Not only that, the rage will cause the boss to make mistakes, fumbling some attacks and even damaging itself sometimes.
So rather than being DPS, Tanks or Healers, the Tonker has a new Role: Annoyer.
(Incidentally, Demon Hunters also get a new spec with the Annoyer Role. They annoy their enemies by talking endlessly about their sacrifice.)
While soloing and questing, the Tonker should annoy the enemy a lot, then auto-attack.