a hell of a mess meaning

[American slang]
Inf. a terrible mess. (Use caution with hell.)
  This is really a hell of a mess you've gotten us into.
  I never dreamed I'd come back to such a hell of a mess.

Examples

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1. And they've made a hell of a mess.
2. It sure caused a hell of a mess out there,
3. So, this is a hell of a mess.
4. But you ( Clinton ) created a hell of a mess for the country.
5. They just make a hell of a mess.