One of a race of brutal humans in 1726 Jonathan Swift novel Gulliver's Travels (5)
I believe the answer is:
yahoo
(Other definitions for yahoo that I've seen before include "Human-looking beast in Gulliver's Travels: search engine conglomerate" , "Uncouth person" , "Rude or brutish person" , "crude fellow" , "Lout (in Gulliver's Travels)" .)