Hodor is doing what Hodor does!

In Game of Thrones, “Hodor” is a character’s name, but also a shortened, repeated phrase that is revealed to mean “Hold the door”. This phrase is linked to a tragic backstory where a young Hodor, named Wyllis, experiences a seizure during which he hears “Hold the door” repeatedly, eventually shortening it to “Hodor”. This event is triggered by Bran Stark warging into his younger self, causing a mental disability and making “Hodor” the only word he can say.