They call a specific aircraft type FIFI ?!? That must be one helluvan aircraft raaaight thar!The 320 is "Fifi," the CRJ-200 is the Slatless Wonder (in polite company; in impolite company I describe that airplane in incredibly nasty terms).
For some reason people call the EMB-120 Brasilia the "Bro," though I largely don't conversationally.
Various Embraer jets have been referred to as "Jungle Jets."
My recollection of "FIFI" is more of a verb-form term used to describe what a job-keeper does when confronted by that horrible, cognitively dissonant state of reality when one is presented with a broke-ass aircraft (of any type). Everyone in management is pretending that the aircraft ain't actually broke. You, as a pilot, definitively know that the aircraft is broke, but yer being "asked" to fly the airplane anyway. So, you saunter out to the line demonstrating proper Captain swagger, and state, "FIFI !" (EFF It, Fly It).