Top Definition
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
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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