When people put their fingers in their mouth to whistle - what are they doing with their fingers?

Are they squeezing their tongue? pressing down on the bottom of thier mouth - what?


Because i have been attempting it and i have no idea how to do it.


I thought perhaps where you put your fingers had something to do with it.When people put their fingers in their mouth to whistle - what are they doing with their fingers?
I'm sure the fingers do have something to do with it.


Like you I've tried and failed, just ended up coughing like mad with dribble everywhere.

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