a rotten egg
1. Someone who is thoroughly, intrinsically inclined to behave badly and cause trouble. His parents did everything they could to steer him on the right path, but I think Chris might just be a rotten egg. She started hanging out with a few rotten eggs in her school, and her grades have really suffered ever since. We could tell he was a rotten egg even at a young age.
2. childish A loser; someone worthy of teasing. Typically used in the phrase "last one in is a rotten egg," an exhortation to get people to enter some place or do something, especially quickly. Come on, we're all jumping in the lake—last one in's a rotten egg! A: "Last one in the bouncy castle is a rotten egg!" B: "Hey, no fair, you got a head start!" Hurry up, you guys! Last one in the pool's a rotten egg!
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