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A bastardisation of the terms 'Anus' and 'Appendectomy' (or 'Vasectomy') would appear to mean a removal of the arse.

It's really the stitching up of ones arse hole!
If you stitched up a frogs arse, you would in fact have given it an anusectomy!
by Terence Michelson August 04, 2004