pretty self explanatory.. when someone has a sweet life, there life is going pretty good at the time. Or it also can be used sarcastically when that person's life is not so sweet.
girl: Dude! I just got a nice new car for my 16th birthday
friend: sweet life! :-D
or in a more sarcastic way..
girl: Dude my parents are making me take a pottery class and go country line dancing with them
friend (mocking her): hahahaha sweet life?
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