A pubie is a term, often considered slang, for a pubic hair. More specifically, it refers to the hair that grows in the region above the external genital organs after puberty.
This area, known as the pubic region, becomes covered with hair as a secondary sexual characteristic during adolescence. The term "pubie" is a diminutive or informal way to refer to an individual pubic hair.
While not a formal anatomical term, "pubie" is commonly understood in informal conversations to mean a single strand or collection of pubic hair.