A wolf whistle is a two-toned sound with a higher, rising pitch for the first half of the whistle, and a lower, decreasing pitch on the second.
There are several ways to put the sound of a wolf whistle on a text:
Hear various ways of wolf whistling at Soundsnap.com.
When you’re trying to grab a taxi, or catch someone’s attention, only a big fat juicy wolf whistle will do! Learn how it's done at Lifedeathprizes.com.