what does the black Volkswagen car say to the man that has a toyota hybrid car at the end of the advertising?

its a new ad about how volkswagen car are kind of better than hybrid cars, and then at the end a old black volkswagen say: how does your hybrid sound like? and the man says huuuuuu.. and the black car says a word that i dont understand. its something like cold or cool. this is an important question because i made a bet. and i think i win it. but im not sure, so i need your answers