The act of finally following through in the comfort of your bathroom following a long period of constipation. The feeling of joy mixed with a likely feeling of discomfort due to the build up of matter since the onset of constipation creates the strained feeling of childbirth from the rear. Usually followed by a feeling of weary elation that is once again similar to that feeling following the birth of ones child.
'I finally gave bumbirth today.'
by MollyGenevieve May 12, 2005
Get the bum birth mug.