A dancing monkey is an accomplice who follows the leader (silver back) at all times, through thick and thin much like an urchin except acts more like a master's puppet.
The dancing of rage as the coin drops in the "slot" and the monkey jumps to life.
As he bent over, his plumber's crack was glaringly obvious, so I took out a 5c piece and dropped it in the "slot" (his crack) and jumped back shouting loudly, "Dance Monkey, DANCE!" and so is born the dancing monkey!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi