subs. phr. (old).See quots.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v. He is one of KING JOHNS MEN, eight score to the hundred, a saying of a little undersized man.
1867. W. H. SMYTH, Sailors Word-Book, s.v. KING JOHNS MEN, the Adullamites of the navy.