it's a jungle out there
1. Some place is dangerous. Be careful when you go out tonight—it's a jungle out there!
2. The world is characterized by ruthless behavior and competition. All the top students are competing to be valedictorian—it's really a jungle out there. Don't expect this kind of consideration in the real world—it's a jungle out there.
It's a jungle out there.
The real world is severe.; It's hard to get by in everyday life. A: Gee, people are so rude in this town. B: Yup, it's a jungle out there.