I don't know what in the heck Jim Starlin was thinking with this sound effect:
I believe I'm on record as being opposed to onomontoPOWia that are nothing more than common English words used as sounds, but this is easily the most egregious and least effective example I've seen to date. Come on, The Bronx isn't even a city, it's just a borough, you know? If you're going to hack your way out of coming up with an actual effect, at least go for something incorporated.
Plus, it's a crappy sound effect. When a guy with metal fists hits a giant hairy gay ape-man/galactic vampire from outer space wearing a sporty blue cloth tunic, the sound you'd get would be nothing like "BRONXX". Off-hand, I can't think of anything that would make that noise, to be honest. If you're going to lame out with a city-based word, right here in Texas we could offer him "meXIa!" or "BANGs!" or "FROGNOT!"
I have to be honest with you, I'd love to see a comic book use "FROGNOT" in some way. Villain name, onomontoPOWia, the call sign for Wonder Woman's invisible jet, I don't care, just give me some Frognot!