In this tutorial, we see how to whistle loudly by putting your fingers in your mouth. First, place your two fingers from each hand into your mouth. You will use the middle and pointing fingers from each hand. Place your fingers underneath your tongue and hold the tongue back while you whistle. Push the tongue to the back of your mouth making a seal around your lips. Push air out of your mouth going out into the middle. This is the easiest way to make a loud whistle sound while just using a simple hand motion! Do this to get someone's attention and enjoy!