Hip hip hooray
Hip hip hooray (also hippity hip hooray; Hooray may also be spelled and pronounced hoorah, hurrah, hurray etc.) is a cheering called out to express praise or approbation toward someone or something, in the English speaking world and elsewhere.
By a sole speaker, it is a form of interjection. In a group, it takes the form of call and response: the cheer is initiated by one person exclaiming "Three cheers for...[someone or something]" (or, more archaically, "Three times three"), then calling out "hip hip" (archaically, "hip hip hip") three times, each time being responded by "hooray".