* Disreputable or undesirable people: It's used to describe a group of people who are considered low class, untrustworthy, or generally unpleasant.
* A miscellaneous collection of things of little value: It can also be used to describe a collection of things that are considered unimportant or worthless.
Examples:
* "The bar was filled with riff-raff."
* "The attic was full of dusty old junk and riff-raff."
Origin:
The term "riff-raff" has a long history, with its origins tracing back to the 16th century. It is believed to have originated from the combination of "riff," meaning "rubbish," and "raff," meaning "rags."
Note:
"Rif-raff" is generally considered informal and derogatory. While it can be used in a humorous or sarcastic way, it's best to avoid using it when referring to people or groups.