Помогите! Английский, 7 класс. Как понять выражения?

1. He is a lady killer

2. He is a couch potato

3. He is a killjoy

4. He is a lazy bones

5. He has a sweet tooth

6. He is a chatterbox

7. He is a sleepyhead

8. He is a nose poker

9. He is pigheaded