It's laughable to suggest I would take base my opinion on a YouTube video of a 1992 movie.
Various unlikely theories derive it from "f####d up, got ambushed, zipped in [a body bag]" (if this is not simply a backronym), French fougasse (“land mine”) or English fugacious. Derivation from an Italian word *fugazi (“fake”) is sometimes suggested, but no such word exists in Italian.
Especially when referencing a word that doesn't exist