(new)origin, Vancouver, BC, Canada
from the word flail, to act with abandon. Has many meanings; losing something can be called flailed, running around like a chicken with your head cut off usually when high on drugs can be called flailing, someone going crazy would be called a flailer, flail would be a bunch of random stuff that a flailer has amassed. Can also refer to wasting time.
"Rob ran through the alleys digging through the dumpsters flailing the night away."
"Janna faliled her backpack in that alleyway over there!"
"Look at all those books, t-shirts and old newspapers, Devin has quite the pile of flail!"