The Collaborative International Dictionary
Fee-faw-fum \Fee`-faw`-fum"\, n.
A nonsensical exclamation attributed to giants and ogres;
hence, any expression calculated to impose upon the timid and
ignorant. ``Impudent fee-faw-fums.''
--J. H. Newman.
Douglas Harper's Etymology Dictionary
exclamation of the giant in "Jack the Giant-Killer," c.1600.
Wiktionary
n. 1 (non-gloss definition: A nonsensical exclamation attributed to giants and ogres.) 2 (context by extension English) Any expression calculated to impose upon the timid and ignorant.
Usage examples of "fee-faw-fum".
I figured that after an hour or so of digestion and this peaceful family scene I would make an effort to extract a little Latin lesson out of Wolfe, and find out whether Gebert really had said anything or if perchance Wolfe was only practicing some fee-faw-fum, but an interruption came before I had even decided on a method of attack.