You won't get shocked off a 12VDC system.
Pretty hard to drive enough current through the natural skin/body resistance at 12vdc.... But I will tell you, you *might* feel something if you lay a sweaty arm across the terminals of your battery. And of course, if you are stupid enough to try and stick your tongue across two conductors at 12vdc, you *probably* will feel that (Try it with a nine volt. Go ahead. I'll wait.)
A loooong time ago, in electronics class, IIRC now, 50vdc was supposed to be the upper limit before lethal currents could develop through a body. There are (I understand) a lot of welders than do have open circuit voltages in that range and I have heard of people being knocked on their keister by them, but I have not had that privilege.... yet.
Is 100 milliamps still the recognized lethal current? I don't know. At 100ma (1/10th amp), R=E/I your body resistance ACROSS THE HEART would have to be 120 ohms to be fatal.... pretty hard to do.
From the Univerity of Illinois
: "A rough value for the internal resistance of the human body is 300-1,000 Ohms."
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