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My belief is that the term originates from a situation where you have to poo without any toilet paper.
Rather than hold it in 'til he found a suitably equipped W.C. facility, the 'commando' would use his underwear as a substitute then discard them, hence the term.
Not to be confused with the S.A.S. wipe, which involves poking your finger through a leaf, wiping with the aforementioned finger and cleaning by retracting the finger through it whilst simultaneously performing a twisting motion with leaf clasped in the clean hand.
I could tell you how I know this but then I'd have to kill you.
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