A rough, coarse, loud or uncouth person; yokel; lout.
A humanoid cryptid said to exist in parts of eastern Australia, and also reported in the Bahamas.
1985, Michael Raynal, Yahoos in the Bahamas, Cryptozoology, volume 4:
To give a cry of "yahoo".
To search using the Yahoo! search engine.
An exclamation of joy or enjoyment.
A battle cry.