British:
gutted - very upset, devastated
hack - a newspaper reporter
knockers - a woman's breasts
prat - a fool
quad (1) - an open space between buildings, usually at a school or a university
wicked - very good, excellent, outstanding
aggro - aggressive, violent
gaffer - the manager, the boss
lav - toilet, lavatory
rubbish - to make very negative comments, to strongly criticise
scarper - to run away
yob | yobbo - an aggressive, impolite, rude person
afters - dessert, sweet dish eaten after the main course of a meal
effing - used as a less offensive substitute for the highly-offensive taboo word "f.....g"
nick (1) - to steal something
nick (2) - to arrest somebody
nut | nutter - a crazy or strange person
oi! - a sound used to attract someone's attention, like "hey!"
posh - high-class, stylish
toff a wealthy, upper-class person
toffee-nosed - snobbish, pretentiously superior towards people of lower social class or income
git - a fool, a stupid person
vac (1) - vacation, holiday
wog - an offensive, derogatory term for a person whose skin colour is not white
blast (3) - an exclamation expressing annoyance or anger