Teh, to rhyme with Meh. Which is in no way indicative of my feelings toward Teh forum, despite me not having been around much lately. It's more to do with having a job which motivates me.
I pronounce Teh as in TE-rrible, as has been said, but when I say it out loud to someone who knows what it is I usually just call it Teh, not 'Teh Forum'.