It's raining cats and dogs (meaning it is raining very hard)

May I pick your brain? (meaning may I get your advice?)

Well, I'll be a monkey's uncle! (meaning that I am very surprised by what I just learned)

Put a sock in it. (means "shut your mouth" or stop talking.)

(That'll happen) when pig's fly. (It's never going to happen)

(Don't) beat around the bush. (Don't avoid saying what you really mean to say. or "get to the point" of what you're talking about)

Ross: I wanna buy this awesome dinosaur toy.. but its like 2000 dollars!

Chandler: 2000 dollars?! that's insane money to spend on a toy. You don't wanna 'burn a hole in your pocket', do you?

Burn a hole in your pocket -- spend too much money

Probably you need to Philochko! Who better than him?

He is good and funny teaching english! you can watch his videos: 

http://www.youtube.com/watch?v=CyaLUo5YMus

wow thanks those are greeeeeeeeeeeat