Liar's Club

Here are four possible definitions of a term found in The Encyclopedia of Bridge. Only one is correct. Can you find it?

What is the meaning of the term "HUM"?
 

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Try again! An expression for players who are having a good time during the game. Sometimes referred to as Happy, Upbeat and Mirthful.
Try again! A legitimate form of defensive signaling in which suit preference signals are given in declarer's trump suit.
You're Right! An acronym for Highly Unusual Methods, which are agreements typically barred from most events.
Try again! A term applied to players who hem and haw when it is their turn to bid - passing information to partner. A pair that does this frequeently is said to use the HUM system: Hesitate, Utter and Mutter.