An imp in a dream is a symbol of disorder. Dreaming of imps is a sign that you need to organize or simplify your life. You may have accumulated too much psychological clutter.
Dreaming of imps can mean that you have lost control of yourself or of a situation in your life. The specific activity that the imps are engaged in can provide you with some knowledge regarding how you have lost control and how you can regain it.
An imp can represent a part of you that is chaotic and out of control, or a part of yourself that you view as negative and try to repress.
Imps are sometimes associated with the Devil and can be a warning that you are taking the wrong path or that you are making a choice that will cause harm to you or to the people around you.