Definitions by Plcf

heinlein pig 

A person so set in an opinion that facts and data will not change their mind. Derived from Robert Heinlein's never try to teach a pig to sing quote.

Antivaccers are Heinlein pigs, no matter how many studies show vaccines are safe and effective, they will insist on not having their children vaccinated.

heinlein pig by Plcf July 14, 2019