Wiktionary
alt. 1 (context vulgar slang English) shit, shite 2 (context vulgar slang English) something cool, e.g. 'That's the shiz' meaning 'That's awesome' or 'That's really cool'. n. 1 (context vulgar slang English) shit, shite 2 (context vulgar slang English) something cool, e.g. 'That's the shiz' meaning 'That's awesome' or 'That's really cool'.
Wikipedia
In the Book of Mormon, Shiz is a Jaredite military leader who was beheaded by Coriantumr. Since the nineteenth century, the account of Shiz's death in the Book of Ether has been claimed by critics to be an error in the Book of Mormon. However, Mormon apologists argue that the statement may be physiologically accurate.
Usage examples of "shiz".
So he wrote to Shiz, asking a cessation of hostilities, and offering to give up his kingdom to save his people.
And it came to pass that Coriantumr wrote again an epistle unto Shiz, desiring that he would not come again to battle, but that he would take the kingdom, and spare the lives of the people.
And it came to pass that when they had all fallen by the sword, save it were Coriantumr and Shiz, behold Shiz had fainted with loss of blood.