First, recall that wolves don't actually possess the capacity to whistle:「small meat orifice」: might refer to forming one's lips into a very small 'o' shape, a puckered「miniature orifice」(arguably, the smallest human orifice under most conditions is the one that is nearly always closed in order to prevent the unintended release of fecal matter). Doing so then enables one to whistle, with practice. Whistles and chirps used by scouts and sentries to signal one another when enemies were about, so be sure to see 狼 and find out who was the wolf, and who was being scouted. One can imagine that the first male to spot a prowling female wolf in the heat of estrus (female wolves are called 'bitches' by the way) signaled to his pack buddies, perhaps something similar to what has occurred in the West, with elements as「orifice and rod in reciprocating motions of booty dancers jiggling vibrating, chorus line of singing girls dancing during the rites of spring」as seen in many cartoons of the previous century, a common cause of QUEEFING, WHISTLING, and emitting CHIRPS.
　There are conflicting explanations for the origin of the wolf-whistle, but in recent times and in places where there are no actual wolves, this whistle has come to represent noticing sex appeal, by either or both sexes, but is often deemed politically incorrect by some females who may interpret the se elements as WHISTLING, SCOUTING, CHIRPING for an「orifice of some very young and small meat.」
　「Viewing women as commodities [see 品] was also made customary from Song Dynasty (960 - 1279) forward, both in the suddenly expanded labor market and within relationships. Men could sell their female kin to slavery or prostitution, and frequently did.」
　　[　https://www.zum.de/whkmla/sp/0910/hersheys/hersheys5.html 2011-04-05　]　
　「Bound feet were a mark of beauty…. Women, their families, and [her owner] took great pride in tiny feet, with the ideal length, called the 'Golden Lotus,' being about 7 cm (2.75 inches) long. …The process was started before the arch of the foot had a chance to develop fully, usually between the ages of 2 and 5. …Bound feet were once considered intensely erotic in Chinese culture. …Qing Dynasty sex manuals listed 48 different ways of playing with women's bound feet.」
　　[　https://en.wikipedia.org/wiki/Foot_binding 2012-12-17　]　
　「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
　　[　https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14　]　
　Alternatively, the sounds emitted from one's「small meat orifice」may merely be the chirps, whistles, and other musical tones of flatulence, a warning to be mindful of danger in the nearby air.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: a whistle; sentry
Unihan extended: whistle, blow whistle; chirp
EDRDG: scout; sentinel