Misspelling of The Joker(From Batman). Also said by Alfred in a very Batman comic, in attempt to show his accent.
Now a meme for the character, used mostly on the IMDb messageboard The Dark Knight(2008).
Can also be spelt The Jocker or Teh Joker.
Guy: Man i love Teh Jocker, hee was awesome in The Dark Knight!
Teh Jocker looked at Batman