「Trichomoniasis (commonly referred to as 'trich') is the most common, curable sexually transmitted disease in the world. …Trichomoniasis is caused by a one-celled parasite, Trichomonas vaginalis. Trichomoniasis affects both women and men. The most common location of infection in women is the vagina, and in men it is the urethra. In women, the symptoms of trichomoniasis may include yellow-green vaginal discharge, fishy odor, pain during urination and sexual intercourse, and genital itching or irritation. Men usually do not show trichomoniasis symptoms, but some may experience discharge from the penis or burning during urination or ejaculation.」
　　[　link now-dead was https://www.trichomoniasis.org/ 2013-09-27　so instead see https://sacace.com/sexually-transmitted-diseases.htm　2023-05-17　]　 　 (see 鮅).
In its original parlance, describing a thing or situation as "smells fishy" did refer to having probable cause for extreme doubt and suspicion, but most folks do not realize why innocuous fish are so maligned in this manner. A fishy or pungent-smelling discharge from the vagina or penis may signify the presence of an infection, so caution was advised...and still is today.
　Roughly one out of three women ages 14-49 in the United States develop a vaginal bacterial imbalance known as bacterial vaginosis (BV) during their lifetime. BV is characterized by unpleasant odors, and potentially painful side effects, as well as the risk of associated health issues later in life. 「Bacterial vaginosis (BV) is the name of a condition in women where the normal balance of bacteria in the vagina is disrupted and replaced by an overgrowth of certain bacteria. It is sometimes accompanied by discharge, odor, pain, itching, or burning. How common is bacterial vaginosis? Bacterial vaginosis (BV) is the most common vaginal infection in women of childbearing age. In the United States, BV is common in pregnant women. …Not much is known about how women get BV. …However, some activities or behaviors can upset the normal balance of bacteria in the vagina and put women at increased risk including: Having a new sex partner or multiple sex partners. …It is not clear what role sexual activity plays in the development of BV. Women do not get BV from toilet seats, bedding, swimming pools, or from touching objects around them. Women who have never had sexual intercourse may also be affected. What are the signs and symptoms of bacterial vaginosis? Women with BV may have an abnormal vaginal discharge with an unpleasant odor. Some women report a strong fish-like odor, especially after intercourse.」
　　[　https://www.my-obgyn.org/bacterial-vaginosis.php　]　
　　[　link now-dead was https://www.trichomoniasis.org/ 2013-09-27　so instead see https://sacace.com/sexually-transmitted-diseases.htm　2023-05-17　]

External source definitions
none located, and you ought to ask yourself, why not?
definition speculated from combining the elements, or, from usage in other glyphs