A specific form of
disappointment, wherein something that seemed so
amazing and wonderful for so
long finished with a stink that stains the whole previous positive experience.
Reference the reboot of Battlestar Galactica (BSG) being so flawless until it dwindled into an embarrassing conclusion.
BSG upset etymologically related to shorthand "v. upset" as in very upset, or "v.g." as in very good.
If Kate is chosen to be the One to Replace Jacob on LOST, I will be
BSG upset!
or
I thought that
guy was totally my
soulmate until I found out he was super super gay and I was his beard. I am BSG upset.