Originating in Long Beach California, the term "dyke clip" refers to a bicycle clip turned key chain that lesbians hang from their belt loop in order to indicate to others that they are gay.
Since the dyke clip is a silent indicator, referencing a dyke clip is usually unnecessary. Some examples of use however might be, "Check out how many keys that broad has on her dyke clip" or "Man that's a jingly-ass dyke clip" or simply "Dyke Clip Alert!"