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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!
taint by Chane. February 1, 2020
The scientifically/anatomically correct word for taint is perineum.
Taint by Ace Ball October 18, 2018
That space between your balls and your asshole
My taint smells funny
Taint by Female Faggot August 27, 2018
the skin inbetween the anus and the balls or vagina
i just licked her taint
Taint by raviisaslut March 12, 2017
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."
taint by HyaenusDominae August 20, 2010
The region of skin between the genitals and the anus; often accompanied by dingleberries.
Although he can't yet grow any facial hair, Mike can still grow a two-foot Santa beard off his taint.
taint by ???????????????????????? October 12, 2007