I don't really associate the term with original as-specified parts however odd the mix may seem, though it could certainly be applied. To me it's reserved for parts which have been swapped seemingly at random without any apparent rhyme or reason. Probably the funniest example I've seen recently was a Columbine with Accushift downtubes adapted onto what I suspect were Shimano bar-ends, a modern Campagnolo rear derailleur, a modern Shimano hub/cassette, a '70s Suntour front derailleur, and modern dual-pivot brakes with '70s Weinmann levers. It felt like a glimpse into the Lovecraftian horror which the owner must be living through every day.