I. ya ‧ hoo 1 /yɑːˈhuː/ BrE AmE interjection spoken informal
[ Date: 1900-2000 ; Origin: From the sound of a happy shout ]
shouted when you are very happy or excited about something
II. yahoo 2 BrE AmE noun ( plural yahoos ) [countable]
[ Date: 1700-1800 ; Origin: From the name of a race of human-like animals in Jonathan Swift's Gulliver's Travels (1726) ]
old-fashioned someone who is rough, noisy, or rude:
a bunch of time-wasting yahoos