From Vanity Fair by William Makepeace Thackeray.
Major O'Dowd, who had served his sovereign in every quarter of the world, and had paid for every step in his profession by some more than equivalent act of daring and gallantry, was the most modest, silent, sheep-faced and meek of little men, and as obedient to his wife as if he had been her tay-boy.
What's a "tay-boy". I couldn't find the word in my dictionary. Nor did a quick Google search yield any useful results.