Much more subtle than fuck you or go to hell, but with all the impact. It is the abbreviated imperative for, "You should
get bent over, so someone can
sodomize you on
Christmas!" Used in reply to outrageous requests...
Spouse: "
Honey, could you and your friends please quiet down? I'm trying to speak with mother about the baby shower."
Other Spouse: "Hey
bee-atch, get bent! Can't you see that me and my homies are watching
the game? And tell that old hag to suck my dick while you're at it?"