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1 definition found From The Jargon File (version 4.4.7, 29 Dec 2003) [jargon]: magic smoke n. A substance trapped inside IC packages that enables them to function (also called blue smoke; this is similar to the archaic phlogiston hypothesis about combustion). Its existence is demonstrated by what happens when a chip burns up ? the magic smoke gets let out, so it doesn't work any more. See smoke test, let the smoke out. Usenetter Jay Maynard tells the following story: ?Once, while hacking on a dedicated Z80 system, I was testing code by blowing EPROMs and plugging them in the system, then seeing what happened. One time, I plugged one in backwards. I only discovered that after I realized that Intel didn't put power-on lights under the quartz windows on the tops of their EPROMs ? the die was glowing white-hot. Amazingly, the EPROM worked fine after I erased it, filled it full of zeros, then erased it again. For all I know, it's still in service. Of course, this is because the magic smoke didn't get let out.? Compare the original phrasing of Murphy's Law.