a serious medical condition, wherein your cranium, or brain, has changed places with your rectum, or asshole. it can lead to jail time, unwanted pregnancy, divorce, loss of job and/or income, and public embarrassment.
joey: oh man, i can't believe i broke up with chloe; she's the best thing that ever happened to me. how could i be so stupid?
zoey: you may have been suffering from rectal-cranial inversion. you may still be. consult your psychologist or your proctologist as soon as possible.
joey: thanks, you're a real pal. i guess i need a tractor.
zoey: for what?
joey: to pull my head out of my ass!!
zoey: true dat.