An epithet used to express extreme frustration. It's funny because it refers to Ned Beatty's character getting ass-rammed by hillbillies in the movie "Deliverance," while defeating the listener's expectation that an orifice, rather than a geographic location, will be mentioned as the terminal word. Originated by maddox.
Or F-MITE, for short: an expression that attempts to fully convey the combined sentiments of utter disgust, contempt, shame, and anger with a pinch of quiet resignation to one's current circumstances... when things couldn't get much worse...when faced with two equally unattractive and unpalatable options.