your guess is as good as mine- I have absolutely no idea
ex. I don't know what happened here. Your guess is as good as mine.
when pigs fly - something that will never ever happen
ex. I will marry him when pigs fly.
to steal someone's thunder - to take credit for the works of someone else
ex. She stole her friend's thunder when she told the manager that she was the one who initiated the idea, when actually, she just heard it from her friend.
the whole nine yards - everything
ex. You're hearing it right; I'm taking the whole nine yards. Will this amount be enough?
pipe down - to be quiet
ex. Pipe down! Everything is under control now.
pig out - to eat so much very fast
ex. He is pigging out in the school canteen as we speak.
off the hook - not needing to deal with a rough situation anymore
ex. The statement of the witness let him off the hook.
mumbo jumbo - nonsense
ex. All that mumbo jumbo has nothing to do with the issue at hand.
loose canon - an unpredictable person who can cause damage if left unchecked
ex. We better keep a close watch on him. He's a loose canon and may ruin our plans.
