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1.
When some poor bastard has been badly constipated for ages and finally manages to go..... The bowel movement that follows is so horrifically brain bursting that it literally feels like the arse is going to detatch itself from the rest of the body...

Can also apply to the result of too much bum love....
*helen goes to the loo, hoping that this time she will be in luck and finally manage to empty her bowels..*

helen: "OHMYGOD!!!! JIM I THINK MY ARSE IS GOING TO FALL OFF!!!!!"

jim: "dont worry, i will look up rectal detatchment online, im sure we can fix it dear"
by little miss offhernut June 14, 2010