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Gad zooks (or gadzooks)
Game is afoot - The
Game is up - The
Game of two halves
Gee whiz
Generation X
Genius is one percent inspiration and 99 percent perspiration
Get down to brass tacks 
Get off on the wrong foot
Get over it
Get the sack
Get thee behind me Satan
Get underway
Get used to it
Get your dander up
Get your goat
Giddy aunt
Giddy goat
Gild the lily
Ginned up
Ginger
Ginger up
Give a wide berth
Give up the ghost
Glass ceiling
Gloom and doom
Go and boil your head
Go berserk
Go by the board
Go by the book
Go-faster
Go haywire
Go like the clappers
Go off half-cocked
Go out on a limb
Go postal
Go over like a lead balloon
Going to hell in a handbasket
Go pound sand
Go to pot
Go to the dogs
Go to the mattresses
God is dead
God rot them
Godfrey Daniel
GOLF - Gentlemen only, ladies forbidden
Gone Dolally
Gone for a burton
Good as gold
Good in parts
Good man is hard to find - A
Good men and true
Good riddance
Good Samaritan
Goody two-shoes
Gordon Bennett
Got my mojo working
Grace of God - There but for ...
(Take with a) grain of salt
Grand slam
Granny dumping
Grasp the nettle
Grass up
Greased lightning
Great unwashed - the
Green eyed monster
Gregory Peck
Grinning like a Cheshire cat
Gry - Words ending in
Guinea pig
Gung ho