Hold your horses is an idiom meaning “hold on” or “wait”
The saying is typically used when someone is rushing into something. It is often combined with linked idioms such as cool your jets or look before you leap.
Example: Hold your horses! We are almost there.
One of my favorite songs when I was a child…Yeah, I’ll admit it’s a little embarrassing now.
http://www.youtube.com/watch?v=XQBvMob3YOE
When I was a child I never had new clothes because I was the youngest and my mom would wait for my older sisters to grow out of their clothes so that she could hand down the clothes to me and I could grow into them.
The “big cheese” is a slang term meaning “the boss,” or a very important person in a company.
to screw up: to make a mistake
to nail (something): to do something perfectly
Stop being a couch potato and learn English!