A usually fully functional almost-Apple Macintosh computer rebuilt from various dead-Mac pull-out and commodity PC parts to avoid Apple's high prices for similar Apple-sourced but functionally identical parts. A cousin somewhat to the Hackintosh.
Jim got a bunch of Apple and non-Apple parts from some dead Macs, PCs, and his own workbench and cobbled together a little FrankenMac. Not quite as pretty but it works fine.