Wolf-whistling
Encyclopedia
Wolf-whistling or finger whistling is a type of whistling
Whistling
Human whistling is the production of sound by means of carefully controlling a stream of air flowing through a small hole. Whistling can be achieved by creating a small opening with one's lips and then blowing or sucking air through the hole...

 in which fingers are inserted in the mouth to produce a louder and more penetrating tone.

A wolf-whistle is a two-toned sound (like 'whip-woo') commonly made using the above technique to show approval of something or someone (originally a person thought to be sexually attractive
Sexual attraction
Sexual attractiveness or sex appeal refers to an individual's ability to attract the sexual or erotic interest of another person, and is a factor in sexual selection or mate choice. The attraction can be to the physical or other qualities or traits of a person, or to such qualities in the context...

).

The wolf-whistle originates from the navy General Call made with a boatswain's pipe. The general call is made on a ship to get the attention of all hands for an announcement. Sailors in harbour would whistle the general call when seeing a pretty woman to draw fellow sailors' attention to her. It was eventually picked up by passers-by, not knowing the real meaning of the whistle, and passed on. Over time, the precise tones of the general call were flattened somewhat into the wolf whistle common today.

Technique

Although the "wolf-whistle" or "wolf-call" sound can be produced using a conventional whistling technique, a louder and more effective form is usually used. To produce a wolf-whistle, one or more fingers are inserted into the mouth to shape the opening, allowing a forceful stream of air to be blown through.

Generally, the more air forced through the mouth, the louder the whistle.
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