wahey,int.Children's slang.|wəˈheɪ| Also wahay. [Echoic.] An exclamation expressing delight or exhilaration. 1979Beano 2 June 3/2 ‘Now, spin round and round, then let the welly go.’ ‘Sounds easy! Wahey!’1989Buster Holiday Special 56 Wahey! We've always wanted to be in the school team!