1. Don't bring any riff - raff into my house!

2. Who let all this riff raff into the room?

3. Is it only the riff - raff who leave litter about in the parks?

4. It was mainly the riff - raff o f the place that caused all the trouble.

5. The serious climbers would not be seen dead with such riff raff.

6. Haven't you been told that it's dangerous to ride alone through all that riff - raff?