cock-a-hoop
/ˌkɒkəˈhuːp/adjective
predic.
- extremely and obviously pleased, especially about a triumph or success（尤指获胜或成功的时候）得意洋洋的。
词源
mid 17th cent.: from the phrase set cock a hoop, of unknown origin, apparently denoting the action of turning on the tap and allowing liquor to flow (prior to a drinking session).