Several ways to make a really loud, annoying whistle. They all require practice and a lot of trial and error.
Start with the 4 finger whistle: Easiest to do, and easy trasition to other popular finger whistles (2-finger, pinky whistle, “OK” sign whistle) Hold both hands with the first and middle fingers fully extended and tightly together, all other fingers tucked in. Rest the tips of your middle fingers together, palms in. Put your fingers like this into your mouth, under the tip of your tongue and fold the tip of your tongue back so it folds almost in half. Rest your index fingers firmly in the corner of you mouth. Now, blow. You will not make any noise. Don’t worry. Keep blowing, and adjust the angle between your fingers, without changing the overall confirmation of your fingers and mouth. Move them in and out, and up and down. Eventually (it takes practice) you’ll produce a feeble whistle at first, but eventually you’ll make people’s ears ring. happy whistling!
Jason R Remy
“Open mindedness is not the same thing as empty mindedness.”
– John Dewey Democracy and Education (1916)