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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.
Gay guy 1: I want to do something freaky.

Gay guy 2: How about THE unmentionable?

Gay guy 1: I said freaky not fucking disgusting.
by Mistress of mayhem May 17, 2008
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Performing "The Unthinkable," then you put your dirty wang in her mouth.
See above for "The Unmentionable."
by Gargamel2 August 13, 2008
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