A mysterious asylum for autistic kids within Carlmont High School. Uncoincidentally, the BTI program has most of their classes there. T-Hall can also be used as an adjective to describe someone as "fucking autistic". People known to survive T-Hall are known as T-Hallers.
"Damn that kid is so T-Hall, he can't even walk bro" or "That T-haller just whipped out the Glock from his lunchbox"
by Patagosaurus January 01, 2019
by Patagosaurus January 02, 2019