Some rude and crude sailor's would say get your "Jesus Boots on" (my usual expression)just before a storm or a fight, in case you had to abandon ship. (to walk home on water) Some captains and sailors would object to the blasphemy, tempting fate, so it was toned down to St. Peters shoes. Alternately, it could mean deciding ones fate (and shipmates) at the gate, so to speak. I'm so bad I'd have to hold my breath until I hit bottom, and then run like hell for the nearest shore.

Someone should ask my Guru, Cyril Tawney (Ye Olde Ancient Submariner Spanner Wanker) tell him an Old Raleigh boy asked after him if you do.

Oh, I'm a lean and unwashed Tiffy, I come up from Plymouth town. I can fix it in a jiffy, if you'll hand that spanner down......