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http://straightrazorpalace.com/general-razor-shaving-related-discussion/4730-explain-your-forum-username-19.html
This topic has been around for a while.

Essentially it is an old nickname. A...

I can play along too.
Literally a rez dog is a large indiscriminately bred dog that first nations people keep as pets, often seen at large on reservations. It is also a nickname given to non native...