A.k.a. chad or perineum. The region between genitals and arsehole. Taint gets its name from the sentence: It ain't pussy, it ain't arse. i.e. 'taint pussy, 'taint arse.
Q: What on earth is a taint? A: The perineum. Q: Huh? A: The chad!
By Chane.
Perineum
The scientifically/anatomically correct word for taint is perineum.
By Ace Ball
That space between your balls and your asshole
My taint smells funny
By Female Faggot
the skin inbetween the anus and the balls or vagina
i just licked her taint
By raviisaslut
a slang used to refer to the perineum, the part of the body between the anus and genital organs, overlying the pubococcygeal muscle. This term supposedly originates from the fact that, "'Tain't your balls, and 'tain't your ass," "'tain't" being a contraction of "it" and "ain't", in this case, meaning "it is not."
SON: "Hey Dad, how come they call it a taint?" FATHER: "Well son, 'cause 'tain't your balls, and 'tain't your ass." SON: "Oh."
By HyaenusDominae