The third eye is the eye of wisdom. A Hindu and Buddhist concept, it refers to a consciousness/awareness that is beyond one's normal five senses. The fact that K.R.I.T. can sense his girl's third eye illustrates the strength of their connection.
The Naughty by Nature hit "O.P.P." doesn't have any curse words, but many oversensitive radio stations played a "clean" version with the word "kitten" edited out, surely the first time that word was censured.