There are many different ways to create a whistling sound with your mouth. Some ways are easier than others. One way involves grabbing the bottom lip. The bottom lip whistle will enable you to create a short but very high pitched sound. The first few times you attempt to do a bottom lip whistle, you may notice a wet, slurping sound. This is due to saliva.
Lick the front of your bottom teeth.
Place the thumb and index finger just below the bottom lip, approximately 1/8 inch from the corners of your mouth.
Pinch your thumb and index finger together, and gently pull the bottom lip away from the teeth. Do not pull so far as to cause any pain.
Suck in a forceful breath through the bottom teeth. Continue to suck until you hear a high-pitched whistle.