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?"
basicly telling someone to go to hell or fuckoff. also it means to get bent over and have anal sex. a word of warning do not tell parents to get bent instead say go to hell!!! or to save your self from getting grounded dont say anything at all.