I use the term to mean an avatar/mortal version/incarnite of Lorkan/shor/Shezzar/Tall Papa.
That right there is incorrect. I'm very sure Tall Papa is not even closely related to Shor/Lorkhan/Shezarr in Redguard myth. Sep, the second serpent, by far is the closet thing to Lorkhan.
Actually, I think that all the TES heros were Shezzarines during the time their games were set, which is one of the reasons they can do things that nobody else can, even in Lore: IE, the CoC can use the magic of the Runestones, but the mages guild isn't even sure that ther IS magic in the runestones.
The only one close to being the Shezzarine is the CoC. Just because you are an ass kicker, doesn't make you the Shezzarine.
What exactly are HoonDings?
HoonDing-The Make Way God. Yokudan spirit of 'perseverance over infidels'. The HoonDing has historically materialized whenever the Redguards need to 'make way' for their people. In Tamrielic history this has only happened three times-twice in the first era during the Ra Gada invasion, once during the Tiber War. In this last incarnation, the HoonDing was said to have been either a sword or a crown, or both.