When someone's chest is in lack of muscle. Very skinny person, to the point, you can see his/her ribs.
You need to pump that bird cage you.... You are a weak private and you need to pump that bird cage of yours.
A shelf, or part of a shelf, in a supermarket, where reduced goods are displayed.
So called because they are going "cheep cheep"!
Customer Service Assistant: "Madam, you'll find baked beans going cheep for 5c a can, the bird cage"
Customer: "Bird cage?"
CSA: "Because its going cheep cheap!"