Naturally, I felt pretty foolish, and, while I tried to pass it off with something about your still being green and raw, the ice was mighty thin, and you had the old man running tiddledies.    From Wordnik.com.  [Letters from a Self-Made Merchant to His Son Being the Letters written by John Graham, Head of the House of Graham & Company, Pork-Packers in Chicago, familiarly known on 'Change as "Old Gorgon Graham," to his Son, Pierrepont, facetiously known to his intimates as "Piggy."] Reference