an insanelyobnoxious brass instrumentalist that specializes in being an asshole. in other words, one who pisses off everyone within a 1000 foot radius with his/her deafening musical playing.
After a long day on the gun range - it's the guys who leave early instead of picking up the spent brass casings for recycle/reuse with the rest of the class...
Tom and Keith claimed to have just received a call from the Chief telling them to report back to work. Nah, fuck that, they're both just a couple of brassholes...
A boss, manager, supervisor who is a royal pain in the ass.
Always chasin' your tail for some work that doesn't matter but they want just to let you know who is the head man.
Brasshole - Have you finished those statistics I asked for?
Employee - I thought you didn't need them for another week?
Brasshole - What, you still haven't done them?
Employee - Under breath " You is one big brasshole"
Out loud "Sure I'll have them with you directly"