English Slang: G- J

gaff - house or flat.
gander - to look at.
geek: an unattractive person who works too hard.
get it: to understand something.
glitch: flaw.
gobshite [offensive] - someone who talks rubbish all the time.
go bananas: go slightly mad.
good onya : good for you, well done
goof (1): make a mistake.
goof (2): a silly and foolish person.
goof off: waste time.
goof up: make a mistake.
goofy: silly.
Gordon Bennet - an exclamation.
grand: one thousand dollars.
grass: marijuana.
greaser - slang name for a 1950's style man.
grog : alcohol, beer.
grub: food.
grubby: not clean.
grungy: unclean and stinky.
gut: a person's stomach; belly.
guts: courage.
gyno - gynaecologist

hacked off - fed up, annoyed.
hairy: difficult; dangerous.
ham-fisted - clumsy.
hammered - drunk.
handcuffs: an engagement ring or wedding ring
hang a left: make a left turn.
hang a right: make a right turn.
headcase - mad
hep: sensible; informed.
her ('er) indoors - wife, girlfriend.
hickey: a love bite on the skin.
hip: sensible; informed.
hole in the wall - a cashpoint machine or bankomat.
hoo-ha - trouble; commotion.
hooker: prostitute.
horny: in the mood for sex, sexually stimulated;.
hot (1): sexy.
hot (2):popular.
hottie : hot water bottle
huff - bad mood.
humungous: really big.
hump (1) - to have sex.
hump (2) - bad mood.
hyper: overly excited.

icky: unpleasant.
I.D.: identification.
iffy - dubious, doubtful.
I'm outta here: I'm leaving; I'm departing.
in: fashionable.
ivories: teeth.

jack around: waste time.
jam (1): trouble.
jam (2): improvise (musically).
jamming, to be : going well.
jammy - lucky.
jerk: stupid or annoying person.
jock: someone good at sports.