1st Guy: *Wakes up with sheets stuck to his face*
2nd Guy: Mate I just had the greatest wank ever.
1st Guy: Fuck My Life.
RB: Okay we better not.
FA: My bad, we lost 20% off our mark...
RB: Fuck my life.
SC: What the fuck was that? (regarding chemistry exam)
AB: I guessed on half the questions, fuck my life.
Bobby will never like me because I'm not popular. oh, fuck my life. :(
I hella wanna go to that concert but it's completely sold out. fuck my life.
when you are having a bad day.
when something bad happens to you.
Holy shit, Im getting fat, fuck my life.
Fuck my life, I forgot to do my assignment, motherfucker.
It is also recognized as a weak attempt at humor. Similar to someone who isn't original enough to make people laugh on their own so they are reduced to quoting mega-hit movies that everyone has seen so many times that they won't even laugh at the movie itself, nevermind the pathetic re-run the person is doing.