"That's wonderful!" (3)
(Other definitions for yippee that I've seen before include "Hooray!" , "Expression of wild delight" , "Excellent!" , "Exclamation of wild delight (colloq.)" , "shout of excitement" .)
(Other definitions for ooh that I've seen before include "Exclamation of surprise or pain" , "Expression of surprise" , "expression of delight" , "sound excited" , "Exclamation of delight" .)