Fluck is different from luck. I define "fluck" as the kind of luck that rescues you from being totally fucked. For example, you fall out of an airplane (fucked)but you land on a haystack,that's fluck. Fluck is bad luck followed by good luck.
Your car does not crash and you find a bar of gold under the seat .- luck
Your car crashes into a tree but the airbag saves you and you find the gold bar - fluck