Definition & Meaning of "taint sniffer"in English

What is the origin of the term "taint sniffer" and how is it used?

"Taint sniffer" is a vulgar slang term for a person portrayed as sexually perverse or humiliatingly submissive. It likely arose in late 20th- to early 21st-century English, drawing from "taint" (a crude term for the perineal area between the genitals and anus) and "sniffer," implying sexual fixation or fetishistic behavior. The term is highly derogatory and used in informal, sexualized, or mocking contexts, often online or in adult humor. It is never neutral and is intended to shame, degrade, or ridicule the person it labels.