(Australian) Fly In to Fuck It - a FIFO (fly in fly out) worker who only takes jobs in remote work locations to have screw their way through the work camp.
She's taking another job in the mines, she's such a Fi-Fi.
A racial slur categorizing people of a certain ethnicity African American/black under this umbrella term.
Synonyms:
A black person, n-bomb etc.
Those two-fis is crazy!