G

Gadget (n.)
A pet method devised in the hopes to have ones name associated with it.

Gambling 3NT (n.)
A bid made where there is a 100% probability of opponents playing in their only making 4-3 major suit game and partner being on lead with a void in your long minor.

Garbage Stayman (n.)
Where you want to throw your system when you end up playing in a 4-2 fit.

Geeber (n.)
A bid of 4♣ made over any NT bid, including gambling 3NT, compelling you to pass if you have opened a gambling 3NT over which partner bids 4♣ p/c doubled by RHO if you also play ROPI even if you’re running suit is ♦

http://www.godofthemachine.com/bridge/09-01-02.html

Useful when you frequently have outside aces despite your denial therof on the opening bid

Gerber (n.)
The most wonderful of all ace-asking conventions in contract bridge. Its knowledge and the frequency of its usage distinguishes the novice from the expert. Also, see: Geeber.

GIB (abbr.)
Double dummy analyser integrated into the BBO software which I will pay Fred Gitelman 200 BBO$ (payable 4 months hence) if he allowed me exclusive access to it as declarer and defender.

Grand Slam (n.)
The noise the front door of the bridge club makes when you pass your partners 7C bid. After you pick his cards off the floor as they fluttered there after the backdraft from his dramatic exit you realize his stiff A of clubs was a probe for 7NT or 7S.

Grosvenor Coup (n.)
A coup that only works against visiting experts who haven't seen you play before.