"Do you haz teh codez?" is an intentionally misspelled, poor grammar, version of the question: "Do you have the [source] code?". It is written in the style of an Internet meme called lolcatz. In this particular case, the phrase is meant to be considered humorous. Origins of "teh codez" version of this meme may be a direct result of this TDWTF article.
Similar phrasing can also be associated with a mocking, or disapproving, tone when directed at [inadequate] requests for assistance from inexperienced users. See also: n00b.