From the interwebs:

"Unsolicited advice refers to giving someone advice or suggestions without being asked for it. It can come from a well-intentioned individual who wants to help, but it can also be perceived as intrusive, unwanted, or irritating by the recipient. People who give unsolicited advice tend to be controlling or overbearing."

From Cahlen:

"If you have to end a statement with "just saying..." you shouldn't have said it."