1. Like doorstop but more severe implies thAT the offending hardware is irreversibly dead or useless. "ThAT was a working motherboard once. One lightning strike lATer, instant boAT anchor!" 2. A person who just takes up space. 3. Obsolete but still working hardware, especially when used of an old S100-bus hobbyist system originally a term of annoyance, but became more and more affectionATe as the hardware became more and more obsolete. [Jargon File]