Definitions
1.NounA rough, coarse, loud or uncouth individual.
2.NounA humanoid cryptid said to exist in parts of eastern Australia, and also reported in the Bahamas.
3.InterjectionExclamation of joy or enjoyment.
4.InterjectionBattle cry. (Can we add an example for this sense?)
5.VerbTo give a cry of yahoo.
6.VerbAlternative letter-case form of Yahoo.