A bobble head appearing in a dream is generally a mocking symbol. If the bobble head resembles you and it belongs to someone else, you feel that this person or a group of people either doesn't take you seriously or is making fun of you.
If you have a bobble head of someone else, consider the way you treat them in waking life. Your subconscious may be pointing out that you frequently or maybe unknowingly make this person feel bad.