1. That’s probably the worst idea I’ve ever heard! You’ve really reached the bottom of the barrel , haven’t you?
2. I guess we can ask George to help. But in my opinion, we’re scraping the bottom of the barrel if we have to turn to him.

Antonym: cream of the crop. This idiom is often used with the verbs “to reach” or “to scrape,” as in the examples, and is used to express a negative opinion about a person or thing.