A younger person who has a problem with bathing; a smelly underclassman;
Taken as smashup of the korean term "hoobae" for a junior in position/stature, and "stank", either past tense for 'stink', or urban slang also for 'stink'.
- What the hell did I walk into? It's like there's hoobaestank everywhere in this lecture hall.
- Take Jin-Hyuk home. He's got that alcohol hoobaestank all over him.