E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Flummux (To).
To bamboozle, to deceive; to be in a quandary. “I am regularly flummuxed”—i.e. perplexed. The first syllable is probably a variant of flam, humbug, deception, and the word seems to be compounded on the model of the word “perplex.”
