teh is "leet speak" used here only to make fun of others
Teh Cult refers to a person who referred to the snarky girls of GC as a "cult" (in which case I should be richer) and it was so silly a thread was formed welcoming all to the cult.
Intarwebs probably refers to one of those politicians who tried to sound intelligent about the internet and failed, but I'll have to look it up. Either way it's another stupid saying that gets used in fun.
http://en.wikipedia.org/wiki/Interweb.
Oh and spelling it with the A is just one more reference to leetspeak.