interjection/ˈbaʝa/
expresses surprise: wow!, why, oh!, whoa!, well!, man!, boy!; expresses dismay, worry, indignation or frustration: gee!, jeez!, gosh!, why, man!, oh dear!; what a ...; you know, like, y'know; go!, leave!, go away! (technically an imperative but can function as an interjection in this sense)
“¡Vaya coche que tiene tu hermana!” — What a car your sister has!
Synonyms: anda, qué, menudo, pedazo
From ir.