yahoo · noun1
From Gulliver's Travels by Jonathan Swift, where Yahoo is the name of a race of brutes.
yahoo · interjection, verb2
Expressive.
yahoo · verb3
From Yahoo!.
Yahoo · noun4
Coined by Jonathan Swift in Gulliver's Travels. According to the Century Dictionary, "[a] made name, prob[ably] meant to suggest disgust".
Yahoo · proper noun, noun, verb5
From the company name Yahoo!; see more on origin there.
Etymology from Wiktionary, CC BY-SA 4.0.