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A slang term for the perineum.
Whilst in the heat of passion you may ask your partner to lick your isn't.

What is your isn't? She asks

It's that bit which isn't my arse, and isn't my balls you may reply!!!
by blackninja980 September 21, 2007
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referring to a bulbous sexual organ, which all heterosexual men find attractive, or in reference to a specific sexual action that one would perform on another.
Give me one good reason as to why I should "isnt" all over her back.
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Isn't does not exist, my the words of English teacher Đilfa
-Isn't that great Mrs. Đilda?
- It is not isn't it's "it's not", here's a F
by JelenaK May 02, 2018
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