To spill the beans (idiom):
To tell a secret
Whoa, easy tiger! (informal):
Take it easy, calm down.
This'll put a smile on your face:
This will make you happy.
No idea (informal, short for "I have no idea"):
I don't know.
Anyone fancy a cuppa? (informal, short for "Does anyone fancy a cup of tea?"):
Would anyone like a cup of tea?