In non computer terms it means oilrig normally. Also IMO it is a forum exclusive word. In face to face discussion normally we do not use this word. Instead we say MY SYSTEM or COMPUTER or MACHINE or wrongly MY CPU.
I can tell you that its pretty much used all the time (face-2-face, digitally) between people who are passionate about their "rigs" (aka nerdy people) - offices, college campuses, schools, everywhere, even between the fairer sex!
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