whistle at (someone or something)
1. To express one's desire for someone or something by making a loud whistling sound. Considered rude or lewd if done toward a person. There's a group of men who sit on their porches and whistle at me everyday when I walk to work. I stopped and whistled at my friend's fancy new sports car.
2. To express one's enthusiastic approval or appreciation of someone or something by whistling loudly or wildly. Everyone in the audience was whistling at the band after the superb concert. We all applauded and whistled at the announcement of the winner.
whistle at someone or something
to indicate approval or disapproval of someone or something by whistling. The men whistled at the beautiful woman who walked by. Everyone whistled at the enormous roast of beef the cook's assistant carried in.
1. To express admiration or desire for someone or something by whistling: The construction crew whistled at passersby.
2. To express approval or disapproval of someone or something by whistling: The audience whistled at the performers.