A dancingmonkey 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!
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.