A common phrase used by many unfortunate people. This phrase gained popularity from the epic movie Superbad (fat mexican who hates life). It is a common phrase used by 4 members of the 3rd Floor Whores RB, SC, AB, and FA. It is used when a person is under heavy stress or pressure, or just walked out of a brutal exam/test or just did something really retarded and regrets it.
FA: Don't worry, we won't lose late marks for this assignment.
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.