hella thick
meaning fine, sexy, phat, hot, etc.
Dayam! That Bitch is hella thick!
It's hella trophies and it's hella thick
In BTS song Mic Drop ft. Desiigner, the English part says "Did you see my bag? Do you see my bag? It's hella trophies and it's hella thick". They are referring that since they work hard their bag contain lots of trophies and it's heavy (thick). Since the original version is in Korean, when they sang that part in English it was funny so many people made it into a inside joke.
Hater: BTS has no talent whatsoever…
Fan: Seriously have you seen their bag?
BTS MIC drop: It's hella trophies and it's hella thick
Fan: Seriously have you seen their bag?
BTS MIC drop: It's hella trophies and it's hella thick