- A battle cry.
- An exclamation of joy.
- (pejorative) A white person from the former Confederate States of America (i.e., Southern United States).
- A loud boisterous person.
- A rough, coarse, or uncouth person; yokel; lout.
- (cryptozoology) A humanoid cryptid said to exist in parts of eastern Australia, and also reported in the Bahamas.
"1835: The natives are greatly terrrified by the sight of a person in a mask calling him "devil" or Yah-hoo, which signifies evil spirit. — James Holman, Travels, 1835 (quoted by Malcolm Smith, above)1985: Yahoos in the Bahamas — title of paper by Michael Raynal, Cryptozoology, volume 4, 1985"