The name only Tunks is allowed to use. Dormin is a name that is an inside joke and there's one that goes with it that shall not be stated for reasons unknown.
A dormin is a crazy Canadian alternate personality of Nimrod which only comes out on occasions.
Tunks will kill Elliot aka HP next time she sees him for entering such a hillarious def for Dormin. :p
Dormin is watching hockey and is skipping out on free beer just so he can chat with Tunks :p