cock-a-hoop 
adjective
Extremely and obviously pleased, especially about an achievement: the team is cock-a-hoop at winning its first game of the season...
- Organisers of the celebrations are cock-a-hoop at news that the guitarist will open an architecture festival in the city next month.
- Far from being worried, I suspect Sir David is cock-a-hoop at the comparison.
- The company is cock-a-hoop at its performance, especially in light of the difficult trading conditions.
Origin
Mid 17th century: 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).