Definition of yahoos:
(v) :
(transitive, intransitive, informal) To give a cry of yahoo.
(n) :
(derogatory) A rough, coarse, loud or uncouth individual.
(n) :
(cryptozoology) A humanoid cryptid said to exist in parts of eastern Australia, and also reported in the Bahamas.
(v) :
(Internet, informal, transitive, intransitive) To search using the Yahoo! search engine.
(n) :
(informal) An employee of the Internet company Yahoo!
(n) :
(fiction) One of a race of brutes, who look and act similar to men, inhabiting the same land as the civilized Houyhnhnms.