A person who performs the work medically. They do jobs in a bad way. That makes jokes.
Architect CHAMBON: one who has no idea of what is doing., I lie down my house and it was not able to rebuild it.
Tinker, ra.1. adj. made tosca and groseramente.2. adj. said of a person: that works this way. U t. c. s.
It is also used as a synonym for inept, lazy or loose.