I know this! The whistle in question is a steam whistle, of a train or ship. Blowing your whistle with hot, pressurised steam has a marvellous cleansing effect
I want to take this entirely literally and I want a list of people who blow on shared whistles without cleaning them. Then I want to ostracize them from polite society.
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Which famously makes them funnier 😆
That said I’m assuming poor referees would be an example.