A person who insists on correcting your typos or grammatical errors.
Also known as a grammar nazi.
Splices the words gestapo and typo together.
Man, I had better change the terrible auto corrections my phone made on my facebook status before the gestypo sees.
George: " I wad going to watch Lost tonight."
Stan: "You mean was."
George: "Dammit Stan, quit being the gestypo."