Boobs, that's it. It's just someone describing breasts as nice and large.
Jay: Bro, I can't stop looking at those big honkers.
Kayden: ikr
Jenice: .. guys I am right here
Gigantic "breasts" of fat on a man's chest
Damn, That guy has some big city honkers! They're bigger than most girls i've seen
Hey, did you see Nathan, he is huge!! His big city honkers jiggle at every step