You say this when you can do two things at the same time or get rewards for both of them
Kill two birds with one stone
It means "ok" and many other things.
Grand
Girlfriend
mot
Let's finish
Call it a day
You say this when something is extremely easy.
Piece of cake
It means "thank you"
Cheers
Funny
Gas
Not very often
Once in a blue moon
You say this when you want to know the gossip
Spill the beans
It means nothing, really. End conversation with this. There's nothing else you can do.
sure look
Dirty
manky
good luck
break a leg
You say this when someone you were talking about arrives
Speak of the devil
You say this when you don't know the name of a person or don't want to mention it
Your man, yer one
Make fun of someone
slagging
something is very expensive
It costs an arm and a leg
You say this when something bad happens but it was also a good thing for you or someone else.
Blessing in disguise
It means "thing"
yoke
Extremely tired
In bits
You want to know what the other person is thinking
A penny for your thoughts