mechanical geek; person obsessed with machines but clumsy otherwise
A mildly derogatory or teasing term for someone who is brilliant with machines but socially awkward or inept in other areas. Often used for engineers or mechanics who are single-minded about their craft.
He's a mechanical geek; he spends all his holidays tinkering with his motorcycle in the garage.
My dad is a machine nut, so he fixes broken appliances right away, but he can't cook at all.
機械オタク is a more neutral term for a machine enthusiast, while 機械馬鹿 carries a nuance of being clumsy or inept in non-mechanical matters.
機械音痴 means someone who is bad with machines, the opposite of 機械馬鹿.
Compound of 機械 (machine) and 馬鹿 (fool, idiot). The term suggests someone so obsessed with machines that they become foolish in other aspects of life.