[ hawrs-feth-erz ]
/ ˈhɔrsˌfɛð ərz /
(used with a singular or plural verb) something not worth considering.
rubbish; nonsense; bunk (used to express contemptuous rejection).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin and History for horsefeathers
"nonsense," 1928, said to have been coined by U.S. cartoonist Billy De Beck; perhaps a variant of horseshit "nonsense," though the latter is attested only from 1940s.
Online Etymology Dictionary, © 2010 Douglas Harper