1903, possibly from dialectal yip "to cheep like a bird" (early 19c.), from Middle English yippen (mid-15c.), of imitative origin.
An exclamation of pleasure, approval, triumph, etc: Yippee, all my candidates won! (1920+)
[origin uncertain; perhaps coined because of the increasing currency of the Chinese term yin and yang, ''the female and male principles in nature,'' influenced by wang, ''penis''; perhaps fr Louisiana French yan-yan, ''ass'']