Whistling is a funny skill: folks who can whistle, wonder how anyone could have a problem with it. Folks who can’t, wonder how anyone could ever produce such a sound. For those of you who can’t, consider learning–a quick, loud, penetrating whistle has many useful applications and can be mastered with relative ease.
Shamelessly copied for the benefit for those cant Sitiee Bajao!!! :))
As for me I can whistle with my thumbs , index fingers, lil finger... but mostly I whistle with my left hand lil finger and Index finger for the loudest and high pitch whistle.