Usually an over exaggerated comment from people who have a bad day or just see something really fucked up.
Example 1: Bob: "Hey Billy, hows your day today?"
Billy: "It sucks Bob, it's like Hell on Earth."
Example 2: Danny: "What is that shit?"
Gordon: "I don't know, but it looks like Hell on Earth."
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Someone who is extremely worried or very nervous about something and they just can't hide it no matter how hard they try.
Before going on the stage in front of 10000 people, Tom was a Nervous Wreck.