ETYMOLOGY
from ninny (a simpleton, a fool) + broth (liquid in which anything has been boiled)
EXAMPLE
“…How to make coffee, alias ninny-broth: a new invention of buttering turneps: to make a loaf of bread to dance about the table, intermixed with profit and delight …”
From: Poor Robin,
By William Winstanley, 1694
Lexicophilia 