A bad egg is a person who is dishonest and unreliable.

For example:

He was dishonest, but he was the only bad egg in the group.

You can’t trust him-he’s simply a bad egg.

It’s no surprise that he ended up in prison. He has always been a bad egg.

I realized he was a bad egg when he pulled the carpet from under my co-worker.

Character matters, and being a bad egg hurts your credibility.

Tradução: mau-caráter, desonesta, ovo podre.