Some of familiar sentences/word for people use it every day.

1. Like back of her hand
means; she know something cause
example; she know this city like back of her hand

2. 24/7 or twenty four seven
means; whole day a week
example; you can access the internet 24/7

3. in ages
means; long time u not seen him
example; i haven't seen him in ages

4. Sick and tired
means; hated

5. sharp
means; on time

6. i will sleep on it.
means; i will think that asap

7. take and easy
means; relax

8. I'm broke
means; u have no money