Orginally started off as a typo for "the", but recently has changed a bit in meaning. "Teh" still means "the", however, it is mostly used in the same manner that spanish speaking people use the word "El".
"I got two cookies with teh whipped cream!" makes sense, but "I got two cookies with the whipped cream!" doesn't. Get what I mean?
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(addendum)
Has the ability to turn nearly any word into a noun.
My definitions are teh win!
That loser is teh sux.
2720 up, 664 down
Either a typo of the word "The" or a way to show extra emphasis onto the next word.
Good - "You am teh su><0r"
Good - "My poo smells like teh win"
Bad - "On teh first day of Christmas"
Bad - "Teh cow says, 'moooooo'"
1024 up, 460 down
An expression used by idiots to helpfully identify themselves to other idiots.
Idiot 1: That's awesome.
Idiot 2: Wait, what?
Idiot 1: Uh, I mean, that's "TEH" awesome!
Idiot 2: Oh, thank god! For a second there I thought I wasn't talking to another idiot!
Idiot 1: "PNWED"!
2452 up, 1184 down
1) Typo for "the".
2) Very
3) An Asian name spellchecked with Microsoft Word.
1) "I just shot teh teacup."
2) "That is teh L337."
3) Teh.
914 up, 463 down
Originally just a misspelling from people typing too fast, "teh" has become a word used by net.writers to exemplify people who are ignorant or simply not thinking clearly (perhaps because they're typing too fast).
I was reading a fundamentalist site the other day, and the writer was all upset about kids listening to rock'n'roll. He believes it's TEH DEVIL MUSIC FROM HELL.
686 up, 370 down
Deliberate typo error of "The". used in online gaming discussion
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