A deadly game of wit in the forests of verbality!
1) To start a thread, you must suggest a rhyme for your mystery word. For example, if you are thinking of the word "gentle," you would say, "I am thinking of a word that rhymes with 'lentil.'"
2) The guessers cannot say the word they are guessing. Instead, they must provide the definition. Example: "Is it '90's slang for a psychopath?"
3) The first person must then say whether this is correct or not: "No, it is not 'mental.'"
Thus, it can conceivably be much harder for the person originating the game than for the guesser(s).
Historical note: http://en.wikipedia.org/wiki/Crambo
Not mentioned in the Wikipedia article is that Boswell was held in high estime for his excellent Crambo play. I haven't yet heard if the same holds true for Stallone or his alter ego, John.
PS - A de facto rule has emerged: the winner of a round is expected to start a new thread for the following round.