夜露死苦 is a sarcastic way of greeting, which is pretty much like cursing at an individual the same time you are greeting him/her. A gang slang, usually associated with Japanese biker gangs.
There are probably a number of ways to decipher 夜露死苦, but translating it literally, it pretty much means "I hope you die in anguish and exposed at night!"
- Tak
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