What does word ‘Yahoo’ mean ?

What does word ‘Yahoo’ mean ?
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‘ Gulliver’s Travels. ‘
Part: Gulliver in the land of the Houyhnhnms.
/ By Jonathan Swift./
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One of the words that the two horses said several
times sounded like ‘Yahoo ‘ . ……….
I could not understand its meaning. ………
Then I understood.
‘ Yahoo’ was the beastly creature just like a man…….
The Yahoo’s hands, feet were like mine, …….
The Yahoo’s face was like mine, but ………..
but . . . .Yahoo could not be taught ………………
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It seems that the creators of web http://www.yahoo.com/

were great jokers .
Or maybe they know how hard the people can be taught.
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Israel Socratus