car is making a horrible sound when i hit bumps i was told it was the rearbearin

What is your question?

So I was told the my rear bearings in my car are bad..but i dont think its is them.. everytime i hit a bump you can hear the back of my car like its slaming down on metal.. the guy quoted me on the part.. but wouldnt tell me that real name of the part.. he said that both sides needed to be done.. and that it was like 200 for the bearings and the frame.. I just want to know what the heck is wrong so i can look up the part my self..