Term for using phonetic orthography to make a speaker seem uneducated/vernacular

Solution 1:

There are two terms, "pronunciation spelling " and "eye dialect", both of which emphasize that the speaker is illiterate, unlettered, or speaking in a vernacular. The first emphasizes the mispronounced aspect of the speech, e.g., "fer sure." Here "fer" (sounds like "fir") is a stand-in for "for" (sounds like "four"). The latter represents words with standard pronunciation like "wimmen" (for "women") and your example "enuf" (for "enough"). The distinction is not always maintained in discussions of narrative, and both techniques appear together. See Peter Finley Dunne's "Mr. Dooley" or Joel Chandler Harris' Uncle Remus stories.

(dictionary.reference.com)