Kludge together parts of words, actually. Probably abusing a foreign language in the process, but I'm speaking english here so that's more hobby than anything.
Foo's used as a stand in for a wildcard in some circles. Killed by foo on dungeon level bar is the classic composition, which I want to say is yet another reference to the acronym FUBAR. You could replace what I was using with *xia or something as well, if you felt like it. I've never really got around to learning the proper nomenclature or specific formulation differences between wu- or xian- or whatever so it's pretty much all a nebulous punch magic thing to me. Fooxia is shorter than punch magic, so sometimes it gets used instead
That said, fooxia's general shtick extends beyond china, if my memory's not going complete haywire again. It's pretty certainly very strong (well, to the extent it's a particularly thriving field to begin with) in china but you got it coming from other joints, too. Most of what I've personally encountered were korean, but from what I understand there's a vaguely farcically huge body of literature that's not been translated even partially into english yet so gods only know what I don't know of.
... that said, it does occur to me I don't think I've seen much of whatever it is that
is coming out of india. Kinda' weird in retrospect.