Au fait – this is an example of a French expression that has
become part of the English Language. It means to have good detailed
knowledge of something.
Bugger all – if you’ve got bugger all for dinner, it means you
have nothing.
Cock Up – This can be used as a verb or a noun and
it means to make a serious mistake or a mistake.
Donkeys’ years – a long time or ages
Gobsmacked - “Gob” is mouth is British English and
if you smack it, you probably would do it because you are amazed or shocked.
Gormless – another way to say vacant or clueless.
Gutted – really upset
Hunky-dory – fine, going well
Knackered – very tired, exhausted
Lurgy – if you’ve got the lurgy, it means you are ill with
the flu or a virus. It means that people will stay away from you.
Nice one! – If someone is impressed by what you’ve done, they
could use this expression. It’s similar to “good job” in American English. It
can also be used sarcastically.
Thanks to Shanthi