Exclamation of joy in response. Usually in response to some announcement or event. For example: Mother:-If you behave well I'm going to buy you an ice cream. Son:-Yay! A child pedaling on a bicycle takes a descent that accelerates the walk. -¡Yupiiiiiii!
yupi!: expressive. expresividad.expresion of joy, alegria.afectividad, vehemence, effusivity.