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1.
A term used for mild celebration, or a sarcastic term for a positive attitude towards life.
"Yeah man, i ollied that set of 3... hate life!"
by This Is Colour May 15, 2007
 
2.
An extreme state of melancholy or depression brought about by thinking the world is against you.
My girlfriend broke up with me, my house burned down and I lost my job. I have a bad case of hatelife.
by Lil H May 05, 2006