Bugs me, too. Why say it and then say you said it? I think some use it as a disclaimer after they say something. If so, why say it and then immediately disclaim it? I think some use it to excuse what they think is a daring and brash comment. They over estimate themselves. More than likely it is just the latest silly fad that started on some TV show or came from a dumb jock of rap singer. Once it was the misuse of "myself" when "me" was the proper word; then there was "each and every", an obvious redundancy; and "whatever". Regardless (No, not irregardless), it is juvenile.
I guess I'm just a stickler for the precise use of the English language.