The unmentionable
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A man takes a shit, then freezes it for a week [or so] to get it good and hard, and another man uses it like a [dildo] on [the other guy].
The unmentionable meaning & definition 1 of The unmentionable.
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Performing [The Unthinkable], then you put your [dirty] [wang] in her mouth.
The unmentionable meaning & definition 2 of The unmentionable.