Pronounced /jɑ:hu:/ for meaning 1, and /jɑ:hu:/ for meaning 2.
1.
People sometimes shout ‘ yahoo! ’ when they are very happy or excited about something.
EXCLAM
2.
Some people refer to young rich people as yahoos when they disapprove of them because they behave in a noisy, extravagant, and unpleasant way. ( BRIT INFORMAL )
N-COUNT [ disapproval ]