schatzi \SHAHT-see\,
noun:
Slang. sweetheart, darling.
He and his schatzi returned to Vienna ten days later with the complete wave equations, though the name of his muse is lost in the mists of the mountains.
-- Russell Targ, "Do You See What I See?: Memoirs of a Blind Biker," 2008
Oh, Schatzie, I stopped wanting many years ago. Now I just accept.
-- Lawrence Sanders, "The Anderson Tapes," 1970
Schatzi is derived from the German word for "treasure," schatz, which entered English as a term of endearment for a woman in the early 1900s.
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